Hi there 
the only current workaround available (in my view) seems to be
next.sonarqube.com/sonarqube/coding_rules
I think rules.sonarsource.com did also include info about a specific rules availability in community and/or commercial editions, right? (i might be wrong, though) 
I do not see a filter for this in the next.sonarqube instance.
Maybe all rules are now available in community edition? \o/ 
btw, i placed my vent about the way a user/customer perceives the result over there.
It is totally understandable that (at sonarsource) different ppl perform different actions to different parts of the system (at different times).
What we (users/customers) perceive is the result of those actions.
cheers,
Daniel