Maybe... maybe not....

My understanding was that a Breather also went by the name "intake bypass valve". It's is more like a safety device... It's a filter with interior flaps that are shut. It doesn't ingest air until the primary filter is blocked (by, like... water) and then the pressure drop in the intake causes the breather to pop open.

Check these out...
http://www.intakeone.com/AEM/AEMairBypassValves.html
http://www.deepstaged.net/aemcivicsi.htm

Taking a leap of logic, but if the breather was meant to stay open it would be mixing hot and cold air, as you suggested it might, so I would think you could just move your primary up off the ground out of water's reach and not even bother with the breather.

Glenn