depends how you define "OK".
The injectors you have wont flow much more than about 220hp worth of fuel. So if you go blasting around with your GT28RS, you'll melt the engine. The boost control will also be all over the place so you'll need to keep the N75 unplugged. the problem is that even with the N75 unplugged, its likely you'll flow more air than the stock tune can fuel for, thus you basically wont be able to go full boost at all.
You cant fit bigger injectors without a remap, though if you also fit a larger MAF housing you'll get something that mostly works, and is a bit safer than doing nothing.
If you want to fit the turbo and carefully drive the car to a tuner, then it'll be fine, just keep the N75 disconnected and keep it off boost.