UV, Purple, and Blue light (most of the upper spectrum of light) without darkening the remainder?
Yes, you can buy longpass filters at pretty much any wavelength range you want. Technically it's impossible for them not to darken the remainder at all, but they should transmit 99% so not noticeably darkened.
Cheaper and easier is just a pair of yellow tinted sunglasses.
is there a way to bend IR into the red colour range so that it can be seen
Not really. Infrared radiation is lower energy then red, so you would need a way of giving the light more energy, which is tricky without using power!
There are special materials which allow 2 infrared photons to be combined into a visible photon with twice the energy, but the efficiency is so low that it is only really practical with a laser beam where you have a LOT of photons.
Another technique is to use high energy (blue or UV) photons to excite some special chemicals so that a low energy infrared photon arrives and triggers it to give off visible light. The extra energy comes from the blue or UV exciting photon. But this requires that no other photons arrive to trigger the material and so only works in the dark and with strong infrared sources.