Do you have a picture of that set up? I just want the option to use open sights for close targets and a scope out past 100 yards. I guess a 3 or 4x red dot might be an option.I have Tech Sights on all of my Ranch Rifles and Mini-14's. They are a great upgrade from factory sights.
Is there a specific reason you need a co-witness? I use Amega Ranges scout mounts with an Ultradot mounted in Warne QD rings. If my red dot fails, I can very quickly remove it and go to irons.
I get a "lower 1/3 co-witness" on my AK's using Mojo rear sights and UltiMAK scout mounts with Ultadot's in Warne QD's, and it's not really that useful to me.