Not sure on the 95 Immobilizer workings, but on the later ones once you had a Immobilizer lock out period (ie wont start) you had to go through a reset motion in order to try again and get it to start, might be worth trying this.
Example, you have 2 keys, one knowingly has a Transponder Chip inside, the second one doesnt or its the wrong Chip Code (but you keep it as a spare) you unlock car put the Key, doesnt start, youve put the wrong Key in (the second key), so you realise silly me put the wrong key in, so you now put the correct key and try it, still wont start, reason is its still locked up mode. to reset it ready for the correct, 1, remove Key, 2, open and close Door, 3, Lock the Door, unlock door, 4 Open Door and Key in (correct one) and start.
Possibly unplugging the Main ECU or removing the Battery for a while should have the same effect but its obviously easier to do the door thing.
The above may help you, but as said, Not sure about the early ones.
Worst case the early ones could have the Imobilizer disabled with and Tech 2 and someone who knows what there doing, guessing your need the Car Pass as well, so all is not lost.
On the Crank Sensor front, still not convinced it wasnt faulty, I had a couple now where theyve been fine but Parked Up for a while and refuse to start due to Crank Sensor issue, and it doesnt always throw a CS Issue Code untill later on or when youve finally got it going again.
Where did you get the Crank Sensor from? anything other than walking into a VX Parts to get one could give issues (did you measure it was the new one under 1K ohms?, as said there about 900 ohms and will read about +- 10 ohms briefly wih a metallic knife etc on the sensor).