Some people do staggered hatches and do OK with it, but most of them have a separate incubator that they use specifically as a hatcher. I’d recommend against it.
The humidity and turning are part of the problem. If there are only three days difference those are probably not all that important but it is an additional complication. I’d personally be more concerned with the chicks that hatch first getting the younger eggs all slimy and messy. That could help bacteria get inside which could kill the developing chicks or maybe even cause one to explode. Trust me. You don’t want a rotten egg to explode or even leak in your incubator.
The other problem is that the first hatch would need to come out of the incubator after the others are in lockdown. If they have pipped, you can shrink wrap them.
Bear in mind that there is a difference in what might possibly happen and what will absolutely each and every time without fail happen. The stinky egg of shrink wrap can happen but probably won’t. A staggered hatch complicates it but does not doom you to guaranteed absolute failure.
If you wish you can add the extra eggs late. Just treat the first eggs as if they were the only ones when it is time to lockdown and hatch. Anything you get out of the later eggs would be a bonus. If you can accept that you have made things more complicated and that bad things can happen, go for it. I look at it that there are ideal situations and there are the situations I deal with.