Personally I don’t care for the typical 410 because of the beaminess of the mids. The Genzler 410 addresses those concerns so if you like the idea of a 410, check it out and give it serious consideration. In addition it is a bit smaller than most and lighter weight so a much easier schlep. I “heard” it at NAMM and it was impressive.
Two 12-3’s would cost more than the 410 and it sounds as if you’re afraid they wouldn’t be loud enough but they would give you the ability to use one or two. Personally I don’t want to play in any band two would not be loud enough for

. Try to check out a pair to see what you think before writing them off. I do not play in loud bands but I have not found myself in a situation where a single 12-3 was not loud enough for me, PA support or no.