Yes its been done quite a lot by now. I used to have a mk5 with EFI RST engine.

You need a Mk5/6 CVH engine mount. You can use the existing gearbox if you want, or upgrade to RS2k MTX75. Go for the EFI FRST engine, its too much hassle to fit the escort RST stuff.

You will need to get OFAC/OFAB engine loom and ECU. I have the wiring diagrams and pinout for this conversion, but im sure once you see the complexity of the job youl change your mind anyway.

Don't bother going down the ZVH route with your current 1.6.