Neat little rabbit hole, thanks. It lead to Netflix's "Magenta Green Screen: Spectrally Multiplexed Alpha Matting with Deep Colorization" by Dmitriy Smirnov, Chloe LeGendre, Xueming Yu, Paul Debevec: https://arxiv.org/abs/2306.13702

Not with a non-visible spectrum, but along the same lines. I can't seem to directly find anything with NIR though;