You could combine the recirculation feature with a Truma on-demand hot water heater. They make one that is a retrofit into the existing hole the Atwood unit leaves.
There is a mode on the Truma that recirculates the water line, and the heater includes an auxiliary pump to accomplish this. However, you will have to find a way to plumb another water line from the hot water heater to the end of the line.
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