The problem with your mate sounds like an assembly problem, not one associated with the cam. Wleding it to a follower, that sounds highly impossible as to stop a cam lobe dead takes some massive amounts of friction.
YMNM, im afraid there is not much you can do to the 1.4, its not a performance engine and thus, its not a popular tunning engine, infact, its not an engine anybody specialises in or tunes. Fact is, companies have to choose which engine to work on. Their development costs have to be recouped, and the development needed to make a wilder cam profile for your engine would need hundreds of cam kits to be sold, not hte odd 5 or 10.
There is sadly nothing you can really do but enjoy your car. You can go it alone and bear the cost of testing adn devolping, but even with your high tax, it might be easier to get a 172 in the end.
The majority (95%) of an engines power is made in the cylinder head and cam profile you run. If you cant fiddle with these, you cant up the power with bolt on mods as the head wont be flowing more per min and the cam wont be allowing the head to.
Its a simple equation, add more air then add more fuel, if you cant get more in per min, then your stuck.
I would concentrate on maximising efficiency as it is, lowering inlet temps as much as possible, reducing underbonnet temps, gaining as much flow off your std cam profile with midl headwork and work on the inlet manifold, but dont think there are any specialists in Singapore, there certainly is a lack of them in HK.