I read on a for sale thread that the 225 engine was modified to run a 182 box. But I guess all the 225 parts that you mentioned would be easier
You have to re-drill the megane block to accept the 182 box mounting holes. Iirc you need to swap the sump over as well.
you need a adaptorplate not drilling, the ND0 box is so muck bigger then a JC5It's probably not when you consider piston rings, end bearings, gaskets, head bolts, cambelt and fluids etc as apposed to a sump gasket and drilling/tapping etc