I just made a batch using the recipe in the following link, increasing the tea tree oil to 50 drops.
Things we did today: Homemade Air Freshener Gel
pdq - I like the idea to use mineral oil and silca. I have some West System Colloidal Silca so I can use that in place of the Cabosil (same thing from what I read). I'll definitely try that in my next batch. Right now, I'm thinking that the gelatin will evaporate quickly so your idea might work better.
The whole house smells like tea tree oil... good thing that Vicky likes the smell.