KEEP AWAY FROM THE ELEPHANTS!!!!
Did you see this post?
Unusual traffic hazard for cyclist
It sounds like the two of you are making excellent progress. Are you still talking about getting Rowan discharged into a neuro rehab facility for the short term?
Does your local community have an adaptive cycling program? Rental/loaner trikes, tandems, Tandem Recumbent Trikes, Bilenky Tandems, Handcycles, etc?
If not, perhaps you could find someone interested in helping you get one started.