In looking at Ebay and Mopar’s websites the cost of a modern C514, C510 and C635 range from pretty reasonable for a new one, used ones for pretty darn cheap in the US, to dirt cheap in Canada for used.
The issues are that one would need to make an adapter which could be done with CAD (cardboard aided design) to then transfer it to CAD (computer aided design), this is basically a 2D activity so flat DXF file is all that is needed. This part isn’t that difficult but would require having the different transmissions in hand. Yes a scanning system would be desirable but I don’t believe it is absolutely necessary. However this could be farmed out to a service for a price... Cardboard is cheap.
The complexity comes in around how to deal with the starter which due to the engines they were fitted to being turbos, puts the starter on the back to avoid the hot turbo and the SOHC thermostat housing with the cross tube running across the back of the engine roughly where the starter would need to be added. (this is a 635 with the hydro throw out bearing):
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In looking at the transmission housings for all three variations of these transmissions (the C635 is a very different transmission used on the 500L, 500X and several Jeeps), there is plenty of material to mill off a thickness of aluminum to make room for an adapter plate and fasteners.
This is the 510, the 514 is similar
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