I wonder if it is possible to thread the needle for pacing between encounter and daily.
Switch all class features to encounter powers and at-wills, for better math and robust balance.
Then add "rituals". These rituals are magic items, that then have specific requirements to fulfill in order to perform. So there can be big powers that get exhausted, but the DM has more say if, when, and how they happen. The DM can more easily account for such novas.
Also narratively, this combination of reliable encounters plus special big rituals is how most stories about magic work.