bmi regional
You're right. It's still possible to get in a reasonable day in Paris by flying out with bmi regional and returning with easyJet (departs CDG 1900 each weekday evening through the summer) but that's not what bmi regional would want.
All the flights from BRS this summer seem to be on the E145 except both HAM rotations (as has been the case since the route started) and the middle ABZ rotation that are on the 135.