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My biggest worry about forced-air cooling an HV cage would be dust. If you ever looked inside a computer case that has been run for a few years, there is an amazing amount of dust that coats the internals, even when operated in a "clean" environment.
At least in a PC, the dust just impedes proper heat dissipation. Inside an HV cage, it will cause leakage currents and eventual arcing, with a possible fire hazard.
If you want to go this route, I would suggest using the fan to pressurize the cage (rather than sucking warm air out), and fit a proper dust filter on the inlet side of the fan. Then, of course, you need to remember to change or clean the filter occasionally....
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