I have three incubators.
View attachment 4312404
Say you put 20 eggs in incubators 1 and 2. Five days later, you put 20 more in, and so on until the first two incubators are full.
When the first ones get to day 16 or 17, they get moved to the third one for lockdown, making room for more in incubators 1 and 2. I always have at least four days between setting eggs and try to do five.
If I only had one incubator, when those 20 are getting to lockdown stage, I'd split the difference of the humidity from 45% to 70% and do 55/60%. Take them out of their racks and lay them on the rubber shelf liner that was already in there.
When those hatch, I'd do as usual, try waiting until they all hatch to get them out. The next eggs due to lockdown are 5 days out, so you wouldn't risk shrink wrapping any others, just the batch you're hatching at the time.
As you can see, this is MUCH easier with a hatcher incubator, but it can be done without one.