To be honest mate for the sake of the cost of an MOT and £42 for 6 months Tax you'd be better off investing it in the bike to get the price you want.
IF you really cant afford the Tax, as long as you are insured then you can ride the bike to and from a garage to a pre booked MOT without tax as long as it is insured
But if as you say it's too much hassle then you would probably have to accept a lower price.
This of course is only my opinion
