Q.Night blooming cereus pruning
I have 2 cereus that are many years old, bloom frequently, but are huge and “leggy.” I would like to prune them, but if I do, all I will have will be the heavy, stiff stems without leaves where the buds form. Is this what I should do and wait for new leaves to grow or should I start new plants from the cuttings and ditch the old plants?
Have seen numerous instructions on starting new plants; however, I’m not interested in new plants unless that is my only option. Would greatly appreciate any advice.

Regular pruning will keep the plant from becoming to leggy and heavy.
You may want to go ahead and start out with new plants from the cuttings.