I'll be up to help. I've been programming in C for 30 years now (and still do). One of my "when I'm bored" projects is updating an early 90s C code base [1]. And I do have an interest in Forth, so this sounds like an interesting project. My email is on my profile.

[1] Viola, one of the first graphical web browsers that assumes sizeof(int) == sizeof(long) == sizeof(every pointer).