OP, I feel for you and all who are dealing with the hay shortage problem.
I've never used cubes as an exclusive source of hay but do feed soaked alfalfa cubes in a mash to my oldest who is lacking in the teeth department, he also gets free choice chopped tim/orchard hay though. I'm sure someone on here has an answer to feeding it exclusively as there are a lot of folks in the same boat unfortunately.
You might also look into getting a group of folks together and have it trucked in from out of state. I know a lot of the extra hay here is going south on trucks. If I'd not already sold my extra, I'd send some your way :(
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.