You can try a sheet of "heat absorbing" glass between your modeling lamp and filter gel. That can take the hit of the longer heat producing wavelengths of light, but not for too long without help. If you don't provide cooling, the glass will either overheat, or re-radiate long waves because of it's own elevated temperature.
Still, it should be fine for your needs, as setup should only take a few minutes at a time. There are many sources of that type of glass, but sheets made for protecting film from buckling in enlarger heads might work well with your case. They cost less than $50, as I recall. Depending on the size of the glass sheet, you have to come up with a workable clever solution for mounting it for best effect, but thats part of the fun...
Voyager
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