A better solution is to pick up a cheap, used D70 or D100. These two cameras had very weak IR filters and so make good IR cameras. See Bjorn Rorslett's site for good discussion on setting up and using a camera as an IR camera.
I only read this stuff a long time ago. Not my cup of tea, so I've no experience with it. He also has a section on UV photography. In addition to cameras, he also talks about particular lenses that are and are not suitable for IR/UV photography.
Nikkors: 17-55mm f2.8, 18-200mm f3.5-f4.5 VR, 70-300mm f4.5-5.6 VR, 35mm f2, 50mm f1.8, 55mm f2.8 AI-S micro, 105mm f2.8 VR micro
Other Lenses: Tokina 12-24 f4, Tamron 75-300mm f4-5.6 LD macro
Stuff: Nikon SB800, Nikon MBD200, Gitzo 1327 Tripod w/RRS BH-55LR Ballhead, Sekonic L-358 meter