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I ended up completely eliminating the immobilizer but prior to doing so it came down to only nine wires (from memory) that absolutely had to be there and they were earth and power wires (switched, unswitched and delayed -terminal 86??), a few wires that ran up to the sensor coil at the key and a couple that ran back to the ECU. All the others that came from various sensors or to hardware were redundant.
If you read down the list of them on the wiring diagram in your Bentleys you'll pretty quickly be able to put them into three buckets:-
1) going nowhere (ie you've already removed whatever was on the other end)
2) going god knows where (ie disappears into the ECU for unknown reason)
3) going somewhere obviously required (ie power, earth, decoder etc.)
1&3 are easy to deal with and 2 i tended to leave alone. If you get to the point where you don't know what you are cutting it might be worth cutting one at a time and checking you are still operational in between.
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