Unsure of the bolt pattern, be interesting to see if its somewhere near. There is a possibility as i think Adey used a 172 sump?
Also cable shift and hydraulic clutch from memory. Kangoo dci hydraulic pedal box would solve clutch issue and fit twingo shifter. Clutch and shafts to sort.
Sounds like the twingo box needs to be investigated as it could be the answer to the issues!
I ran a Jr5 modus diesel box in my Twingo.... long but great for big power and top speed runs. Fitment should be the same as the Twingo box though.
Hydraulic clutch actuation and cable shift, shaft fitment is also different, they have the more modern style inputs into the box rather than the bolt in spider gear style of the jc5
I modified my f4rt back to the f4r gearbox bolt pattern.