Unless you're a Gavin and want the lightest AutoX machine in the world evAr, you may as well just fix your power windows. It'd be more effort removing the power window support hardware and installing the manual parts from a DX than it would be to simply fix the power windows
Someone should have some power parts around, and SURELY someone has a DX spare that they can get the regulators, handles and doorcards from. Just remember, downgrading is a drastic step and will involve many parts...