Pebble before 2.5 used to support HS256 with EAB. Now, only RS256 and EC seem supported. Is there any description how to use an RSA key for EAB with pebble?

I'd prefer continue using HS256 in my test suite for Apache since that seems to be in use at several CAs still. I appreciated that you want to be on the bleeding edge here, but for testing purposes this seem to be a step back.