No, I wouldn't. Dis-budding is meant to help the plant grow it's roots quicker. If these are established plants you already have the root ball. It's just the canes that died back. I had to cut all of mine to the ground too and they're coming back nicely. Some have buds and I'm going to let them bloom.

Just let the new growth do its thing while you rejoice in how beautiful and productive the new growth is! The roses will probably be shorter this year, but should bloom just as well with no additional help from you.

Kate