I have two ideas that I'd like to play around with. I don't know when I'll get around to actually making the associated cultures, but I guess I should ask here to make sure the ideas are feasible before I start.

First idea is a helicopter unit that can hover over water. To make this idea a better fit for HK, the plan would be to make the culture have two emblematic units; one would be an emblematic gunship, the other would be a naval transport that has the same stats and traits and no costs to embark/disembark, and both would be unlocked at the same time (the current plan is to have this "unit" unlock at Naval Air Strategy and replace both the Landing Craft and the Helicopter Gunship). The fact that other land units could transform into the emblematic gunship while over water would be a neat bonus imo.

Second idea would be a land melee unit that's also militia. To make this idea a better fit for HK, the plan would be (again) to make the culture have two emblematic units; one would be an emblematic land unit that doesn't replace any other land unit, and the other would be an emblematic militia unit with Home Guard that replaces Levies. There doesn't seem to be an explicit "militia" class like Melee or Heavy Weapon, despite that being a keyword used with Colossus of Rhodes and Republic, so I'm assuming Home Guard is how militia-ness is determined.

Anyway, I've taken a look at some of the mods listed here and on mod.io, and I don't think I've seen any cultures that have more than one emblematic unit. My suspicion is that this is not possible, but if I'm wrong, please let me know (and I'd like to know which cultures in which mods have more than one emblematic unit)! If it's possible, that might be enough motivation for me to try doing something. If not, then at least I can set the ideas aside forever instead of stewing over them lol.