Doesn't this require that monergists (in general) need to evangelize synergists, and to treat them as unsaved (allowing for the exception you mention)? Don't all the verses that prohibit fellowship, joint ministry, marriage, church discipline, come into play here?

I don't know of anyone who practices this other than the hypers, am I just uninformed?

Do any reformed denominations practice these things that you know of?

thanks,
- Kurt