While I can appreciate the direction you're trying to take with this, I'm not comfortable with essentially forcing a RDM to cast Vercure/Verward every 35s (because as you illustrated, that gets you the best return sans procs).

Utility is supposed to be used when necessary, whereas your suggestion aims to make it part of the rotation. I'd probably just have Acceleration generate mana over 12s or something if we want it to help with mana generation.