I am not very familiar with Element and Liquid, but I can see enough references to PSET that makes me wonder if this can't be used for emulation on Bitcoin.
I have tried to implement an emulator of few opcodes within the "Script Army Knife" proposal (SAKE), but I would be much more interested in Simplicity instead, especially because the formal verification aspect of it.
also, I would love to help with this if there is any need for such help.