But of course we are :-)
I thought about a closed loop system, where the air from the engine is scavenged back to the dehydrator, but figured I don't know enough about how oil and other combustion byproducts will affect the desiccant, so I decided to pass on this idea for now. But am nurturing it in the back of my head.
I don't think the air leaving the dehydrator can ever be more moist than the ambient air (silica traps the water and lets it out only at temperature above the boiling point), so it won't be worse. But we're looking for "better". The reality of the matter is the dry air is only getting to parts of the engine, so this is more of a "feel good" thing than an actual solution to a corrosion problem.
From my POV an option would be for the monitoring system to stop the pump when a threshold RH of outgoing air is met; I do have a relay that could work somewhere... But I do like the excuse to have to go to the hangar, too. Maybe if I could get a text reminding me to come and save the day... As a CB, I need to find one of those USB GSM modems from the previous decade that no one uses anymore, an actual GSM module probably costs around $25...
Don's clear jar solution is brilliant in it's simplicity, with the caveat that if you're already there to check the color, why not change it out. In case you can't go to the hangar for whatever reason.