Mod to lower resolution of NPC portraits?

So I was thinking about something:

People, myself included, run into occasional slowdown when playing on their phones or tablets (moreso in SoD), and a common solution to speed things up when a lot is on screen is to hide the right side section of the interface, which is where your party's portraits are. I have also seen some posts talking about noticing a speed decrease depending on how hi-res a custom portrait happens to be.

My question is this: would there be a way to replace those small portraits on the right side of the screen with lower res copies? I know original BG had THREE portrait resolutions, but the EEs changed it to just 2 (large and medium) which in turn has a much higher than needed resolution picture appear on the main interface.

I suspect that, with lower res pics on the right side of the interface, many people with lower spec devices might avoid slowdown issues without having to constantly hide that part of the UI.

Does this make any sense?