You should also look at how cmForth's metacompilation worked. It's even more fiendish, but relied on cmForth's separate interpreter and compiler dictionaries, which apparently was annoying to use. https://dl.acm.org/doi/10.1145/382125.382916

I didn't notice anything in the article that made me think of metacompilation, but maybe I missed it and should re-read.

Added: you should also look at Bill Muench's version of eForth including its metacompiler. I'm not that big a fan of eForth for practical use (it's TOO minimal) but wow it is simple.