Dude, it should be alright BUT you must keep the boost down AND drive like an old mole.
If your turbo flows more air than the injectors can fuel, by by ringlands and possibly more = rebuild engine.
Boost is not so relevant as air flow, a bigger turbo will flow more air at the same boost pressure as a smaller turbo - everything else being equal. If you fit the turbo, try just using say 5psi, as 7psi is stock boost. I know that the stocker will flow alot more than that, but for example Whasisname is making 257rwkw with only 13psi (or there abouts). My car is at 89% (injector duty cycle) with .85bar on a stock turbo, so it is really important to keep the boost down until you know what it is doing. And whatever you do, drive conservatively.
The other mods you are planning are good, but with a bigger turbo you will probably need a bigger fuel pump and fuel pressure reg as well as a new clutch. This will become more apparent when you get the engine management on and put the car on a dyno to tune it.