Texture Scaling (like PPSSPP): is it possible?

I just stumbled on what looks like the beggining of the idea that ended up in this PPSSPP feature I mentioned:

Use other Filtering than Linear Filtering? · Issue #1468 · hrydgard/ppsspp · GitHub

Looks like it all started with a Linear Filtering replacement idea. So they replaced the linear filtering of the textures with a xBRZ filter, and it worked!

Now, would it be possible to replace the Linear Filtering with a FSR 1.0 filter?