You sure made it hard on yourself.
I have one AR and four sights depending on the outing. The laser stays mounted and I can turn it on/off or use a thumb switch. When parked behind the door, it has the red dot. When plinking, it has a Nikon scope. When hunting (day or night) it has an X-Sight II mounted. I labeled each one on where it goes on the rail (for zero) and the QRs make it simple to change. I don't use the iron sights.
Added: Oh, and if you're worried about shaving a few ounces, change to 10/20-round mags.