Do think about how you use the AR though, the T handle is coming back with those systems so you may need to move your head to avoid it.
I have an LMT AR10 in .308, it does not have the side charging handle added, so I rely on the T handle to cycle. It is a Radian one with bigger levers and it has been OK for me. The occasional case is a bit sticky and requires two hands, not leaving a case in the chamber to cool seems to reduce the issue for me. It is however nowhere near as fast to operate as my friends AR15 with side charging handle. For CSR I would probably need to add a side charger, but for club target shooting it is fine for me.
I would add CG firearms to your potential list of gunsmiths to look at. They can custom build what you request style wise so maybe worth having a chat to with what you are looking for to get a quote. My friend is very happy with his.