the biggest issue will be the bellhousing, there is not a z22se rear wheel drive bellhousing available in the uk, you can get one fom the states as they are used in the RWD Solstice.
You will also need the ecu/transponder/key chips from the donor vehicle, plus the complete engine loom and you will have to divide up the car loom to remove all the transponder wiring.
You should also mark up the Tech2 loom plug so it can be retro fitted into the frontera.
Other than that it should be straight forward, but it might be cheaper to just buy a 2.2 omega as that engine bolts right in (x22xe)