BTW, one of the other guys in this forum has successfully used Silicone gasket sealer instead of Sno-Seal. It should last much longer. Sounds like a great idea.
You seal soles so they are less likely to rot. I honestly don't see how to seal the soles against water without losing breathability through the soles.
BTW, Sno-Seal, AFAIK, is merely bee's wax + a solvent whose purpose is to lower the melting point to where it is easier to melt.
Since soles are thick and Sno-Sealed (or equivalent), and boots are also thick, I figure socks are the most obvious route to getting rid of sweat inside of the boot, through evaporation from the part of the sock that is above the boot.
I'm curious what sort of socks you wear, and what thickness. Some sock materials (like polypropylene) wick moisture away, some don't. Some, like cotton, are hydrophilic (attract and absorb water), and will become soaking wet, which you probably don't want.
Sockless feet, especially if they are sweaty, may reduce boot lifetime, because water is bad for leather. They may certainly cause the boots to stink. I suggest wicking socks are a good thing, for you.
Another possibility would be to use an open cell foam on top of your insole, or in place of your insole. Your feet will be a little cooler, and the foam will temporarily absorb some of the moisture, while you skate. You could try open cell foam carpet padding material. But - CLOSED cell carpet padding material would have the opposite effect from what you want. (That's what I do - my feet get cold instead of sweaty.) If you look at shoe insoles that are designed to be cool vs warm, you will note that they tend to use open vs closed cell foam materials.
I don't know how desiccant vs open cell foam materials stack up against each other...
Also - you may want to avoid using boot covers, or using tights that cover part of your boots. Either would block some evaporation from the leather.
Hope that helps.