Lenses are a thing in the thermal spectra, but you have a point that they are very expensive if your desired objective doesn't coincide with someone else's bulk use case. They are also typically hard to care for and some of them are toxic.
For magnification at least, doesnt help with hunting pythons probably, you can use the focusing lenses for laser cutters, which typically work in thermal wavelengths, to turn a handheld thermal camera into a microscope. Or is it a "milliscope" i guess owing to the limit imposed by the coarser wavelegths.
I wonder how much optical solutions could be solved with the "wrong" lens paired with a well trained transformer or similar modern AI. If google or apple can deblur your family photos is it unrealistic to think you could deblur a thermal image acquired using found lenses?
Crystallography algorithms might even work out of the box? Or be adaptable hopefully?