Yes its no real problem if you are familiar with alarms.
Its all under the passenger airbag, so dash off and lift the airbag and there it is. The alarm and the immobiliser are not connected in any way.
You could remove the alarm, and the remote locking and immobiliser will still work as they should.
The sounder is under the scuttle panel in front of the windscreen and the u/s control is either under the dash by the alarm unit or behind the ashtray, I have seen them in both places.
The ones I have done, I simply cut all the wires close to the Cobra unit and used them to fit a Clifford module.
It was remarkably easy, the only real problem was getting the wiper arms off to get to the siren.