The simple answer continues to be No I'm afraid - the whole end-to-end setup on the 1.2 8v is designed for 60bhp and that's it. You could spend months sorting out bigger induction, intake, throttle bodies, completely re-porting the head, going hairy cam and doing the exhaust - and still only make 85bhp. Trust me, I thought a lot about this!
But, I've now seen and been in my mates 4x4 which today runs a Panda 100HP engine and it is brilliant. Stock 100HP engine and entire wiring loom, but it bolts straight onto the existing 4x4 gearbox, takes the same clutch and everything. The route my friend took was via a written-off 100HP which
donated the entire wiring loom and interior as it happens, so the 4x4 now sports full Climate, dark 100HP interior, dark windows and rear spoiler - all as per 100HP. Looks completely brilliant and just as stealth as mine.
But on balance, the cheapest thing you could do is have a straight swap with a 1.4 8v engine - remove the 1.2 and fit the 1.4. These things are almost free from breakers yards and I will be doing this when my 1.2 finally calls time with the supercharger.
Or you could just keep clear of motorways and relish in the sub-3000rpm torque of the 1.2 and enjoy yourself!