As above, buy a G60 engine if you want to do it.
Yes, bolting a supercharger on is easier to get right than a turbo installation, allowing you to get away with running low boost pressures if you use a supercharger without any internal mods and resorting to an intercooler (mainly due to the much lower intake temperatures than when using a turbo). You can also pretty much get away with a re-map (replacement chip) to deal with the fueling but its not exactly the easiest/cheapest job in the world if you cant design and install all of the kit to do it yourself and cant find anyone to write you a custom chip/modify the ignition timing. Add in the unknown factor of your current engines overall health and it makes much more sense to just drop a G60 engine in thats designed for forced induction from the start with lower compression and uprated components to suit. Add in the fact you can get a fair bit more oomph out of a G60 engine than they come with from stock (admittedly at a cost in terms of overall and especially charger reliability) quite easily and its a bit of a no-brainer. Still not cheap though
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