I was going to put a 90 deg. Street elbow , then a full bore stainless ball valve but they dont do a male and female, only Female Female , so would need a nipple and that ends up with a lot of hardware on the end.
Radiospares have a full-bore 1/2" BSP valve with male/female fitting: https://uk.rs-online.com/web/p/manual-ball-valves/1385645/
If you look at the thread from the thread end, not the fitting end, its wound on clockwise - or from the fitting end, hold the tape, wind the fitting clockwise. Or use loctite 575 - you can go either direction . . .or both . . or up and down . . .