Gforth and pforth both need a C compiler so that's not a huge improvement. but there must be some Forths written in assembly or like the GreenArrays chips that run Forth natively.

just kinda daydreaming... but I like the clarity of that lisp.fs! wish we can break the dependence on C

This is why I wrote Shoehorn. The idea is to be able to bootstrap a #Forth environment for a processor of your choice in a matter of days, not months or years.

Of course, I haven't yet written said Forth yet (that's still in progress), but Shoehorn itself allowed me to write a simple, graphical demo on an emulator in a matter of a day, in time for an SVFIG presentation.

I retargetted Shoehorn to 64-bit RISC-V in about an hour. Untested, but it should mostly work fine as-is.

It's not the easiest thing in the world to use, but once you get your head around it, you should find that it is extremely productive.