To PiperClassique
I don't think you need to have a SPL licence nor any sort of glider licence to be allowed to stop the engine in a TMG. If you have a valid TMG rating valid on an EASA PPL(A), you may fly the TMG within its limitations, and hence stop the engine in flight.
You also wrote that you have a TMG with VP and TW variant.
My understanding is that there is no such thing as a variant for an EASA TMG rating. Your EASA TMG rating is valid on all TMG's subject to familiarization training. My understanding is that the fact the you took a test on a variable pitch and tail wheel TMG does not allow you to fly SEP with VP nor TW, even if you have a valid SEP rating.