I am in your exact same position. I work 9-5 on weekdays which means that I am unable to stay up to 4 in the morning on a Monday. However, our Saturday platoon is very accommodating to those in time zones outside of the US, including Europe and Australia.
Our operations still run late on Saturday nights into the early hours of Sunday for those in the U.K. and Europe, but it's the weekend, so I couldn't give a fuck. I'll then just lie in till 11 on Sunday which is fine for me. Virtually all the trainings in our platoon take place on Friday nights so again, not much of an issue if you have weekends off.
Personally, I've been a part of multiple different communities and ArmA units, both US and EU based, and yes, the late nights are a bit of a nuisance, but you won't find a unit more professional, as large, and as dedicated to realism as the 506th. Just an opinion though.