that's even worse than the PCE / PC-FX layer situation because you don't have an easy resolution you can scale up to with a common integer divisor, although I don't think it's possible to have 2 different vertical resolutons? the display would never sync.

I guess non-integer scaling on the x won't matter as much here as it's not scrolling, but if you want to see what happens if you do that on scrolling games look at the horrible mess that is a lot of PCE games with the old video implementation where pixels get bigger/smaller and give a very visible wobble to everything.