John,
I had a solution in mind for that, but as I've reverted to 4 pots, that's as far as it went.
I can see the sense in Geraint retaining the 5 speed. Then all it needs is the oil filter/foot mount mod. 'Same as your's.
It's less work to do that way. Leave all the mounts as they are, leave the gear shift as it is.

