Good job on the TTR, they go well. If you want to you should be able to get a 21" front rim and some dirt tyres for not too much $$$.
Is the XR250 for your wife? A friend is selling a Yamaha Serow/XT250 in Hanoi. The nice thing about the Serow is it has quite a low seat. Price is pretty good and it's been well looked after - https://www.facebook.com/media/set/?...6514324&type=1