Which is why we have a sub forum called "part 135" smart a$$.

29singlespeed, Seabourne might be the way to go as others have said, they require ATP MES for captain, not sure what they require for f/o.
Part 135 flying can lead to a great quality of life, well done for not being fixated on the airlines.
Oh and by the way, singlespeed huh? big wheels too? We have gears for a reason man, I'll take the 27 or 30 speed Sram anyday.