Buy a 'real' Merwin, Hulbert.
Seriously.
Sure, prices have risen - thanks to C&WAS folks - but they can and do turn up and some are quite reasonably priced, though an average price will buy you a new Colt.
Get a high-quality pair of replacement grips, in order to save the originals, clean it thoroughly, lube it well and use a sensible blackpowder load that doesn't exceed standard blackpowder velocities - and don't try to 'compete' with the thing, and you'll do fine.
Plus, you'll have something that's 'real' - that you can point to with pride, and speculate about what it's seen during its service life - and not a clone with no history.
Besides, should you ever part with it - you'll actually make money - and no clone does that...
Good Luck!
Vaya,
Scouts Out!