Pred will give you a floppy heart valve, among other things. To be used as sparingly as possible.
I've got one of those bike things you describe under my desk. It works just fine! I ordered it through Amazon.
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I injured my knee back in the era when Jimmy Carter was seeking the Dem nomination. The ortho doc said he couldn't do a thing with it; there were no structural problems, only damaged nerves. "Take two aspirin and call me in the morning." Oh, skip the part after "aspirin." Now the neuro guy put me on a drug that won't allow me to take but one regular strength aspirin per day. Maybe if he ever does anything for my head, I'll talk to him about the nerves in my knee.
Wow! Doctors don't want you on Prednisone for a long time because of the nasty side affects - osteoporosis being one of them, and the weight gain from fluid retention is never pleasant. It does some other really nasty stuff long term, too, but I can't remember them right off the top of my head. I want to say it is bad for your heart? Someone will have more info I know!!
If I needed a walker, I would get one of those that has the seat, too. Some have baskets or bags attached which looks like it would be quite useful! I would love to see my mother in law use one since she is very tottery, but she says no. Getting her to use just a regular cane has been a struggle! She should probably even have a quad cane, but nothing doing. One of her peers will probably have to talk her into it!
I hope your shoulder feels better soon. I get bursitis in my hip from time to time. I injured it 13 years ago and it likes to remind me once in awhile! Perhaps physical therapy for the shoulder? That helped me a lot when I had problems with mine after a fall.