A couple of real quick-and-dirty adaptation possibilities involving HEPA filters and a shop vac come to mind, with a precharger auto battery or two and an inverter to power the setup. Something more elegant can then be considered and obtained- there are outlets for surplus lab equipment that might have something suitable- as well as a manually operated backup.
The article linked here may be of interest to you as well.
HEPA is one way to go; easily replacable Farr paper air filters might be another.
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