If it is reptile mites, then what you have planned should do the trick. A lot of people see "bugs" and instantly assume they are mites that feed on reptiles. It is quite possible some type of mite/bug that is in the bedding. "Aspen mites" are quite common and don't really harm your snake...but they look bad and seem to annoy more than anything.
If you don't want to microscope the mite for proper identification, then your next best bet is to change your substrate in addition to the treatment you referenced. Use paper towels or newspaper while treating/in-between treatments. If the mites appear to be gone while doing this, but they immediately return once you change substrate back to aspen/coco/etc. ....then it may be a substrate bug issue.