How about a huge mylar bag with face netting like those Muslim women wear, really sticky tape, PRE-TAPED, lighter than duct, maybe a drawstring from inside. I’ll have to think about it some more. You want to keep as many out as possible, and they will find a way in. Could cause heat stroke if prolonger Better minds than mine have probably tackled it. Non-aerosolized spray of some sort that won’t poison you?
Bee’s release alarm pheromones that serve as a target identifier for a swarm attack. Decoys saturated with a synthetic version could serve to redirect an attack. A deployment mechanism that doesn’t further contaminate the user; and, possibly provides the user with a chemical deterrent to a swarm would be ideal.
Aerosal can of foam