You can get it to sound OK at best, but if the playing is really that complex, then summing everything through a PA isn't going to do it any justice. In a metal mix, I don't see raw drums recorded to a stereo track working too well.
I never understand why bands get pissed about things like this. If you were in the situation where you had the correct means to record a full kit, sure go for it. But considering that's obviously not the case, why go for sub-par results just to be "troo" or some bs. He's already cheating and triggering the kick, why not "trigger" the snare, and toms too in midi and make him sound like a god behind the kit?
In the end, it depends on what amount of quality you want to achieve. If you want something good enough to sell to potential fans, check the egos and preconceptions at the door and do what needs to be done to get the best results possible.