"I have had experiences of self-publishing in the past and find that after an initial flurry of selling, it settles down and you are left with boxes of books you are trying to sell. This is why I am looking for a publisher"

Good idea - that way, it's the PUBLISHER who's left with boxes of books that THEY are trying to sell!!!

Seriously, though, it sounds very interesting. Maybe EFDSS would be interested, or at least have some good suggestions? Good luck with it.