That would be very interesting indeed!
The ideal way for me would be the existence of a programmatical way (preferably in c/c++) to query GNUBG with a position and a dice roll (and maybe some other settings such as ply depth, cubeless/cubeful evals etc) and get a move output, A standalone library/executable that could do the same would also be of use.
Last time I checked the GNUBG code (about 8 years ago), it was very difficult to extract such a function. Perhaps things has changed since then and I should give it another try.
Another way would be for both programs to have some kind of communication protocol in place, but I fear this may be impractical for million of games.