Over on the LF forum someone came up with a good design for a barn door adjustable hood. Such a thing doesn't mask the corners, but you can adjust each door independently and rotate it against direct stray light, so it should work pretty well. I have a Voss clip on hood that I use with some lenses for which I don't have another good shade/filter option. It only has two doors, so not as good as four, but it takes 3" gels and is better than no hood at all.

Yet another adjustable option is a 3-position rubber hood, which isn't as precise as a compendium shade, but is convenient for traveling light.