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It depends entirely on the gearbox type mate. If its a JB1 then no chance as they don't have the internal diameter/clearance. If its a JB/JD then yes but you're gonna have to change the flywheel and by doing so you're going to increase the overall spinning mass to as the flywheel weighs much more... This *may* cause driveability problems as the 1.2 engine struggles to spin up the additional weight meaning it won't rev or pickup speed as freely.
I'm not big on theory though so I'll let someone else take over here with the math side of things: