Uuuh that shit again. Had to write code long ago that tries to set outputs to clone if one of them is a projector (on X11). Seemed simple at first since it seems to be agreed upon that projectors report a physical size of 0x0 via edid. Which makes kinda sense since you don't have a fixed image size. Until I discovered that some projectors don't because the vendor thought it would be better to report an arbitrary value. Then you got setups where there's a middle box that swallows edid or just reports other random data.

Perhaps someone can make an adapter that can sit between the computer and monitor to fix EDID issues?

It has been done for the T221. It's quite a hack, expensive and error prone.