Yes definately possible - you can shoot any of the old pistol comps - Police Pistol now Timed & Precision etc/ with a little ....err......'modification' - the only problem you have is time
While your BP shooters are reloading - the range is effectively 'out of use' - so to run a T&P for Black powder - you need a bleddy long time !
We shoot BP alongside Gallery rifle - so mixed range usage & we have to make it work - as we couldnt afford (or have enough shooters) to run a range just for BP
Roy