As for PMK stoker's breathing/allegy/asthma issue, have you considered moving to a less humid climate?
We moved to the drier state of AZ from MI over 30 years ago due to spouse's family history of arthritis. Was a great/beneficial move for us. Now in our mid-70s we are still doing great.
Nice conversion to a semi-hybrid . . . whatever floats your boat!
This is a tandem forum, so you-2 fit right in!
Pedal on TWOgethert!
Rudy and Kay/zonatandem