What about this? https://techcommunity.microsoft.com/blog/microsoft-security-blog/trusted-signing-is-now-open-for-individual-developers-to-sign-up-in-public-previ/4273554
Some comments say it didn't work for them, but others say it did.
@d-healey you may wanna check this https://signpath.org/. I found it on a github comment, not sure if it works.