Love to get side-view mirrors with the wraparound turn signal lights. Rather not go the stick-on route since hiding the wires would be a pain, but don't want to lose the heaters in the originals. Any chance mirrors from a newer model could be swapped?

They make aftermarket housings, you just swap the guts but honestly it's REALLY hard to make them look good because the lights are usually bubbled out a bit due to all the hardware already inside the very small mirror housing. It's also hard to get ones that don't obviously look aftermarket because of light colors that don't match the rest of the vehicles scheme.

Personally I hate turn signal mirrors of all type, even OEM, hopefully it's just a trend that fades away into oblivion.

I was wondering that since they're common in newer models, perhaps a set might be backwards compatible...

Not at all, unfortunately.