Depending on the exact setup, making an RB to (whatever) adapter plate shouldn't be too hard for a competent machine shop. You should be able to take both bell housings to a shop, have them plot the critical geometry (ie bolt/pin holes) and then have them knock out an adapter plate.
Or the alternative is that they cut two bell housings and weld them into one. Either way contact some local machine shops and see if they're willing to give it a shot.
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