Sell it. It appears that is what you want "us" to validate, given your comments about its less than perfect fit, and the problem with storage. You guys are not going to ride it, face it. Somewhere out in the Craigs List/EBAY world is a barren couple with no tandem to call their own. Share your tandem joy with them.

If I buy a bike and it isn't a keeper, I sell it after 1 year. Otherwise I buy a road bike every 3 years, keep the previous bike as a backup/rain bike, the one before that is on the trainer or loaned to cycling guests, the one before that gets sold. Three road bikes....

a cycling Polygamist