Wool would work over those nappies but I'd say you'd need to boost those nappies overnight.
The wool wouldn't need washing each day - just airing. You only need to wash if it got a bit whiffy. I used to wash about once a week but I only had a few pairs of woollies with Ewan. I re lanolised every time I washed and I always hand washed but spun in the machine on about 600.
Hopefully someone with more recent experience will be along with better advice