mhardy6647
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+1 There are two relevant parameters, as far as I am concerned: sensitivity and the driver's fs. The timeworn rule of thumb is crossover at least 2x above fs.with all the qualifiers you mention I would say find one that fits and adjust .
So... as long as the fs is low enough to accommodate the VMPS's XO frequency and it's at least as sensitive, Bob's your uncle! If it's more sensitive, it can always be padded down with a fixed (or variable) L-pad.
I might have one spare R/S tweeter downstairs if you @davidc live in the continental US and if you'd like to try it! I am nothing if not an enabler.
EDIT: In terms of power-handling -- in the worst case, a fuse or resettable protector (e.g., a Raychem "polyswitch") can always be added to the tweeter circuit. The former may be more audibly acceptable than the latter.