Looks like you've worked out a plan. For another time, someone recently posted (somewhere!) that they used a tote used for traveling. It could hang up and it was used to store bathroom items while traveling but the poster used it for going to a class. Looked like it worked out really well and very similar to the Tag-A-Long from the looks of it.
Good luck with the surgery. I will definitely keep you and your doctors in my prayers. May it all work out to the best that it can.