I'm putting together a similar-ish setup in my 100. I'm planning on running the ARB twin compressor through the second battery (and mine is much smaller than yours). The compressor doesn't pull enough juice for that to be a problem, IMO. The risk of depleting the starting battery is my primary concern. If the second battery gets drained, you just start the car or let solar charge it. If the starting battery dies and you've drained most your second battery, you might be stuck waiting a LOOONG time for solar to charge up enough to get it started.

That being said, the house battery you have listed is pricey. In my situation the second battery is cheaper than the starting battery so if I kill anything, I want it to be the house battery (36ah AGM). Maybe the huge price tag on your house battery is enough to shift priorities to avoid excessively draining that house battery.