I wouldn't do it. And certainly not with PAM. The snake is in tight quarters with limited air and air circulation. Sounds potentially dangerous, even if the PAM is dry.
And I agree that a snake has pretty low chances of getting mites through transport.

Everyone should treat all new snakes for mites as standard protocol whether or not they have mites.
Mites are easy to treat. Personally, I treat new comers the moment they go into quarantine.
And that's really the best way to protect your resident collection.