We are getting close to the point where we are going to run a new lower for the SL8 that will allow it to take AR grips.
One of the ideas we are tossing around is to make the stock adapter modular, like the XCR. That way it can be made to take the new folder system we are launching for the XCR, 858 and 870, which would allow the installation of a folding AR or Skelleton stock.
Not something I'd buy, but you want to make something like the HERA Arms conversion? Sounds interesting, I'm sure there is a market for it, especially if it's less costly than the HERA arms conversion.
Also, you don't happen to have any demo magwells left?