You'll probably get a max of 4-5K trade in, maybe less? You'd be better off selling it for anything higher than this.
If you don't see this as being worthwhile, then you may as well hang on to it but the reality is that you're asking VY prices for a VT.
If you can afford to have both for a while, then find the car you like (dealer or private) and buy it. And like you say, put the VT money on it once it sells.