Skywest or Air Wisconsin in the CRJ. The CRJ 200 is somewhat out of vogue but there is no shortage of sims or instructors available for it, unlike the E-175. So you won't have much competition for the jet, training will go fast, and you should spend a relatively short time on reserve before you hit the line where there will be lots of flying available and a relatively quick time to upgrade.

Be advised, you are trading some QOL for quick career progression.