Bear creek Arsenal makes left hand side charging uppers that are very reasonable. They also offer barrels in 450 bushmaster, 6.5 Grendel, and 224 Valkyrie, among others. Hope this helps,
I'm a lefty and have no problem shooting a rh AR as long as it has a brass deflecter upper receiver whitch most have, I did get tattooed by a tavor bullpup once though!