Here are 2 companies that make bents with same size 26 inch wheels if you think that might help.
http://www.ransbikes.com/Seavo.htm
http://www.lightfootcycles.com/ranger.htm
I really don't believe that a small front wheel caused your fall. I tried to ride a Longbikes Jetstream by myself and felt that I needed at least a 50 lb. bag of potatoes strapped to the rear seat because the rear wheel wanted to lift from the ground. Even worst if I put on the front breaks. Lack of weight on the rear wheel would cause loss of traction and breaking in the rear and make the bike ride like a unicycle with no power to the only wheel that had traction.