Count me in with the tone-later crowd. I typicaly work on getting a number of fine prints (rather than work prints) done and then setup for toning. I only tone in-line as it were when I am printing a new negative that I want to tone the prints of. Even then, I typicaly wait until I have a few prints done and then do some toning work to get what I want. Some toners require a bit different print exposure in order to retain details, while others don't, so keep good notes and you should be able to easily reproduce your print quality and make adjustments when toning.
Soak your dry prints for at least 5 minutes in plain water, and make sure that they are well washed before letting them dry at the rental darkroom. If you've done a good wash job and the prints soak for a bit before toning, you should be able to tone with just about any toner without any trouble.
- Randy