As soon as its not ‘new’ from a shop you’re probably going to lose at least 30% of what you can get it for new. Plus from reading other threads on here, 26″ wheels are seemingly going out of fashion fast. If its a 2013 model, then they are only going to get further reduced, making it even harder to sell.
A 2014 Zesty 327 is £2300 rrp, won’t be discounted for a good few months, so might have better immediate resale value.
Who are your insurer – mine have previously offered cash but reduce the value by 18% to account for the discount they would have got if they’d provided a bike to you. Or could you not argue they can’t replace it like for like and so should give you cash?