So i just wanted to throw an idea out there:
If i remember correctly, Franks were known to have orchards (i may very well be mistaken as i haven’t researched it), and since they’ve always had food bonusses (AOE2) , so what about doing a new kind of farm?
Imagine, you could just reskin a mill and require it in order to plant trees. The trees would only be harvestable 2-3 minutes after plantation. The difference would be one of three:
They would never run out, but have a slower gather rate than farms.
Make them like a renewable berry bush, that would have a very fast gather rate, like hunt, let’s say. But it would have a cooldown of 1-2 minutes, after depletion.
Another idea would be akin to the second, but in the cooldown period it would generate a very small trickle of gold (as if you were selling the fruit after harvest).