I would echo what others have said. Selling a financed car privately is pretty difficult. It tends to put a lot of people off. Selling an expensive car privately is also pretty difficult so you kind of dont really have much chance of getting rid that way. In any case even if you did sell (and got a top price) you are still not going to cover the depreciation alone never mind the interest.
You are thinking of selling at what must be close to the worst possible time in terms of you taking a large financial hit. If the car is that expensive then your probably still going to owe several thousand after its sold.
If you are in a position to afford a car with those sorts of repayments i am guessing you are in a sort of job that your skill set makes you pretty valuable. So if you can i would try to hold on until you get another job. If you dont have enough of a buffer to cover a few months repayments then to be honest given the several grand you will still owe after selling it you would be screwed anyway.
OP will be ok for a while, he has got 5 figures locked up in ISA's.