I haven't tried that particular variety -- and I'm currently only growing miniatures in pots -- but I've successfully grown Margaret Merril (4'x3') and By Appointment (3'x3') in 24" containers.
Heirloom Roses says that Blue Moon is only 3'x3'? I'd think you could totally pot that baby!
My favorite method for pots is a layered lasagna. 4"-6" compost & native soil, then 1/4 cup blood meal, then 1/4 cup bone meal, then compost/soil; repeat until the pot is filled to the very top. My roses love it. :-D

Your response is encouraging. I'll give it a go. They are pretty compact bushes, at least my last one down in Texas City was 'well-bahaved'. They smell so good, I bought one for here in Temple and one for our cabin in Gause. I find their scent totally intoxicating. Only other rose to impact me that way is a Don Juan climber.