I developed Stasis Dermatatis a few years ago. The swelling in my feet, ankles and legs was unbelievable but nothing like your husbands.I developed Edema and I take Spironolactone and Furosemide daily in order to keep the swelling down. I am fortunate it really helps. I Also, Take Klor-Con as well.
The only shoe I found to help were velcro slip on sandals (no backs) with 2 or 3 straps to adjust with the velcro. If my memory serves me at this time, www.shoebuy.com has almost any size and type shoe out there. You might look into this site.