The Attach Public PGP Key should allow you to select which addresses you attach the public key to. As a minimum, it should allow you to select at least 1 address to exclude from having the PGP key attached.

I use the "SimpleLogin" functionality with my proton account to generate random aliases in order to protect my email address. Whenever I reply to an email via the reverse alias the system adds my public PGP key giving away my true address.

If I could select which addresses had the key attached or, alternatively, could specify 1 "catch all address" for my reverse aliases that did not have the key attached that would help.

Thanks