Can IPF5000 print prescored 7x10 red river greeting cards

Can you print 7 x 10 red-river prescored greeting cards on an IPF 5000? Canon lists the minimum media size as 8.5 x 11 -- is there a way to get around this?

 

It's possible, but not ideal. You would need to actually put a shim in the paper feed cassette to ensure the cards feed squarely as the side guide will not come in smaller than 8.5".