Would it really make that much difference to you financially to break it?. Sure they are worth more in bits than they are built, but if you want back in the game one day, your efforts breaking this one will be negated. I'd just sorn it, store it somewhere secure, let the insurance run out and just do it slow time. It won't be costing you a dime while it's just sat there, and you can get stuff done on it as and when you want.
It certainly makes sense for you business wise to have a flagship supra to show your efforts. To leave the supra scene after the 100% trader renewal you just got seems madness.
Stick with it Dave. You'll appreciate it when you cruise down the high street in her watching all the rubber necking pedestrians checking it out. I know I do everytime I go out in mine.