Reminds me that I should probably finish my article on how I wrote a BrainF*ck interpreter in sed.
This I would like to see. Do you have the code somewhere right now or do you plan to release it with the article?
If you're interested in things being implemented in non-standard languages, I would check out the Make-A-LISP project on Github [1]. Someone even took it upon themselves to write an implementation in AWK :) [2]
[1] https://github.com/kanaka/mal/ [2] https://github.com/kanaka/mal/tree/master/awk