Jesel belt drives and HFD Quick Change Timing Covers do not have any interchangable parts as manufactured, and the belt drive depends on its front cover casting for support. In this particular case, I think that modifications would be extensive. If you are asking because you wish to cover up your belt then I would recommend fabricating a cover for the belt drive setup that you already have.
I want to run the cam drive. Hmmm, maybe I ditch the belt drive.