I would argue the opposite. A few hours in a Jabiru actually build some good skills, they are not the worlds easiest aeroplanes to fly. I am a CP and if I saw a few hours in a Jabiru in a CPL pilots logbook I would be happy, even impressed that a CPL would venture this way for some experience.
C210 and 206 hours are great but expensive and in my opinion too many hours of dual, as in more endorsements is just that, dual hours. Hours in command are a better thing.
A CPL doing a bit of RA will also benefit the RA pool, they will learn something from you.