As long as the crank and rods miss the flange and centre web of the case there should be no other mods.
You can fit a magic wand diff housing and shifter to a 4 synchro remote box- just check the sizing and alignment of the diff bearing housing bores when bolted up. Remove the 2 dowels if you have to.
Alternatively you can fit a `puddin stirrer' shift to a stock remote box's diff housing. It works and looks much like the magic wand, and was used on Mokes and pov pack cars from 1969-73 approx.
I have pics, will add them here if/when I find them.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
