That would be wonderful. But what would it do? And what if you used it with like... a normal shield? Or the swiftstrike buckler?

It seems kind of programmer intensive, but I suppose it could be like if you had 2 shields at once, and were able to bash twice as often and perhaps twice as hard to make it viable?

Allthough I wouldn't be able to afford it

If I may suggest:
It be a gun-cannon sort of thing. The regular attack fires a big ole explosive, crystal object (sort of like an auto-detonating neutralizer, but orange perhaps, to match pistons, or just the same color as the shield-mimic's more neon parts). The charge could call down a barrage pretty much exactly like that pickup ("Artillery Strike") does but with different kinds of attack types, of course. Different per shield-mimic! I imagine the Gorgomega-mimic one would be shadow, etc. This makes sense to me, since the Tortos we fought shot an almost carpet-bomb like bunch of OUCH when they extended their back pistons.