I wouldn't prune them unless there was physical damage. The canes should get stronger with time, and if those particularly ones don't, they can be pruned off next year. For now the roses should keep as much cane as possible.

This sounds a little strange but I propped up my recumbent White Meidiland with three rat traps (couldn't bear to use them) and a year later the canes hardened so that I could remove them. The wood was already weathered on the traps and the trap part gone so it didn't look as bad as it sounds.

Ingrid

Prop don't crop! They'll harden off and get stranger as they mature.

Good to have the unanimous support for what my gut told me to do!