Can a solder joint handle torsion force?
Looking at what you have done I would not be worried. I do both copper plumbing and hvac copper (high pressure) if you have a good clean connection that the solder wicks back into the fitting it will be plenty strong.
I have made hangers using 1/2” copper pipe and 4ea 90’s to hang heavy items with and these last for years, I know a guy that makes fancy towel racks using the hot water pipes (with a recirculating system so the pipes are always hot) a good solder joint won’t leak with a little force on it.