Feature Request: Choose branch for profile readme

I foolishly activated the profile readme on my original code repository and am now stuck it. I thought there would be a way to disable it but other than renaming my profile or repo, both of which would cause a lot of hassle (sponsorships, broken links etc), it’s not possible.

As an alternative would it be possible to add a feature that either allows a specific branch to be chosen for the profile readme? Or even something simpler like checking for a default branch such as profile and if it exists use the readme from it?