Found it! Looks great. I'll give it a try and let you know how I go on. Thanks very much, its really very kind of you to help.

@edmaul69
I notice a much better speed on vice warp mode than in the lr-vice "auto" skip, I also notice than the auto forward function is too slow.
I am doing something wrong? I have tried enabling and disabling true emulation. tap games run worse on lr-vice than vice instad

@spruce_m00se

The included libretro Read Me file begins with:

Vice 3.0 LIBRETRO WIP
Very WIP port of VICE 3.0 for libretro .
minimal Libretro arch port (minimal nuklear GUI)
Use it at you own risk !

It's first brought up on the forums here. It really doesn't look like a viable option at the moment.