Minor update. In the process of selling my 002 Bus transmission setup, and purchased a low mileage Porsche G50/01 and a 915 front mount:
My type 4 engine has a 215mm 914 flywheel/clutch, but it appears to be too deep for the G50 at first glance.
Next steps are to see if KEP offers a complete flywheel/clutch solution, or if I need to follow Walley's lead. Also looking for the factory G50 workshop manuals, so that I tear it down to get the bell housing shortened.