For the most minimal workload... consider that a solid floor like concrete will eliminate rodent problems. They can tunnel under dirt floors quite happily. And then you have the work of adjusting the feeding arrangement to defeat the rodents. We feed outside of the coop and pick up all feed each night. It's the most laborious aspect of our setup, with dirt floor coops.
Wood floor can also "help" avoid rodent problems, although they could eventually chew through. Those could be addressed as it pops up.
For bedding on a solid floor, pine pellets are the cleanest, driest, least smelly option IMO.
A poop board under roosts will also reduce your overall cleaning labor.
With an auto pop door, and a gravity feeder and auto watering system, you would have even less to do on a daily basis.
You could also consider roll-out nest boxes that have an insulated holding chamber, to preserve them while collecting eggs a bit less often. Just some ideas. One day I want a fully automated, completely secure setup too. Hehe. It's a matter of cost and priorities... but it's almost always harder to add a feature to an existing coop than to include it in the design in the first place.
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