If you cannot remove the SME mounting board, which presumably is cut to accommodate an SME tonearm, then you might be able to mount a TP directly onto that surface, if you can line it up so the holes needed to fasten the TP to the surface of the mounting board are not situated over empty space, where the putative SME tonearm would otherwise sit. Or, adding a solid piece of metal or wood over the top of the SME mount might be feasible. I've never played with an SME turntable, so don't know exactly what you're dealing with, but TPs are easy to mount because the base does not need to penetrate the surface of a mounting board; it's "surface mount".
SME Armboard for Triplanar
I just got a SME 10 turntable and I would like to try my Triplanar VII SE on it anyone know someone that can provide a adapter plate? It has a SME mounting board that is not removable.