re remit(s) to include the 1940 statement of faith, the new creed, and the song of faith with the twenty articles as doctrine each subordinate to scripture

Historically the United Church of Canada has typically added without taking anything away [cf. retaining the respective rights and structures of the different denominations which negotiated to form the union], often with latent inconsistencies. The general council approval of remit(s) to include the 1940 statement of faith, the new creed, and the song of faith with the twenty articles as doctrine each subordinate to scripture respect legacy statements

i. even if approved by remit(s) the church may not assert interpretation of the 1940 statement of faith, new creed, or song of faith individually or severally which is inconsistent with the twenty articles, where
...the statements when approved were required to be not inconsistent with the twenty articles; ...the general secretary has recently made statement that the general council "...has no authority to take any action (including the issuance of public statements) that is inconsistent with United Church doctrine and Polity" [quoted 09/10/07, Ottawa Presbytery]; and Schedule B [The Trusts of Model Deed] provides
4. And upon further trust, to permit, in conformity with the doctrines, discipline, by-laws, rules and regulations of The United Church of Canada and not otherwise...
ii. while the statements are subordinate to scripture within the basis scripture is interpreted by doctrine
...and as a member of the Order of Ministry of the United Church accepts the statement as being in substance agreeable to the teaching of the Holy Scriptures. [basis 11.2]

The General Council may completely replace the doctrinal articles without being in breach of the trusts provided it do so pursuant to the Act

The United Church of Canada Act provides
26. The Basis of Union set forth in Schedule A to this Act is hereby ratified and confirmed as such, and in so far as the terms and provisions thereof relating to polity and administration are not inconsistent with the provisions of this Act they shall have the same force and effect as if expressly set out herein. 28. Notwithstanding anything in this Act contained, it is hereby declared:- (b) That nothing in this Act contained shall be deemed to limit the independent and exclusive right and power of The United Church to legislate in all matters concerning its doctrine, worship, discipline and government, including therein the right and power from time to time to frame, adopt, alter, change, add to or modify its laws, subordinate standards and formulas and to determine and declare the same or any of them, but subject to the conditions and safeguards in that behalf contained in the Basis of Union. (c) That the United Church by virtue of its independent and exclusive right and power to legislate in respect of the matters mentioned in the next preceding sub-section has the right to unite with any other church or religious denomination without loss of its identity upon such terms as it may find to be consistent with the principles, doctrines and religious standards set forth in the Basis of Union, or any amendment thereof made by the General Council under the provisions of the Basis of Union.
Schedule A [The Basis of Union as subsequently revised]
8.6 The General Council shall have full power: 8.6.2 (1) to legislate on matters respecting the doctrine, worship, membership, and government of the Church, subject to the following conditions: (a) First, that before any rule or law relative to these matters can become a permanent law, it must receive the approval of a majority of the Presbyteries, and, if advisable, Pastoral Charges also. It shall be considered advisable to obtain the approval of a majority of Pastoral Charges also only if the General Council has determined that the proposed rule or law involves a substantive change that, in the opinion of the General Council: i. alters the nature of the courts of the Church; ii. significantly changes the structures of the Church; iii. redefines the Church's understanding of ministry; iv. affects the articles of faith except for gender language applied to human beings; v. changes the baptismal formula or vows made upon ordination or commissioning; vi. moves a section from this Basis of Union to the By-Laws; or vii. alters the Church's understanding of membership. (b) Second, that no terms of admission to full membership shall be prescribed other than those laid down in the New Testament. (c) And third, that the freedom of worship at present enjoyed in the negotiating Churches shall not be interfered with in the United Church; (2) to legislate on all matters respecting property, subject to the limitations elsewhere provided in the Basis of Union, and subject also to the approval of the Conference in which the property is situated;
and
...anything done in pursuance of this Act shall not be deemed to be a breach of any such trust but shall be deemed to be in compliance therewith and a performance thereof, and the entry of any congregation into The United Church shall not be deemed a change of its adherence or principles or doctrines or religious standards within the meaning of any such trust; [The United Church of Canada Act article 15]

but where previous actions were required to be not inconsistent with the twenty articles, if the intent of the church is to say something which differs, this is not the way to do it.