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I think the change required is very very small, how can I request the change to be made?

sign up on GitHub then open a new issue requesting a new feature[1] and in there ask for addition of an easy option to enable relaying and mining non-standard P2SH-P2WPKH transactions that use uncompressed public keys.
[1] https://github.com/bitcoin/bitcoin/issues/new?assignees=&labels=Feature&template=feature_request.md&title=

Thank you, I've done so here: https://github.com/bitcoin/bitcoin/issues/20178

Someone there took note of this in order to sidestep policies: https://github.com/bitcoin/bitcoin/pull/7533