Tacitus says the ships of the Suiones did not have sails, the over all description is similar to the Hjortspring boat.
It's possible sails might have spread through Celtic influence, but this is pure speculation.
Is not the rock art from the bronze age?
It's possible they would have abandoned the sail at some point (the Nordic bronze age seem wealthier and more connected than the later iron age cultures) and it was reintroduced later.
There might be enough justification for a heavier elite infantry.
It is not described what weapons they had; but swords are possible.
We know the Cimbrian cavalry used swords.
But also the women of the Ambrones, so they don't seem to be only for cavalry.
This thread has some interesting references (later derails into a very long argument about iron cuirasses)
https://www.twcenter.net/forums/showthread.php?664783-Hunnic-equipment/
For their units you could have something like
Infantry "Pikeman" (the guys with big spears and square shields)
Infantry Axeman
Slinger
Archer
Champion Swordsman
Woman citizen
Priestess
Merchant
Fishing ship
Merchant Ship
Light Ship
High Priestess*
King*
Great Warrior*
*We don't know the name of historical Minoan rulers, so heros could be more generic archetypes (the other option would be to use Minos and other character from Greek mythology)
https://www.thebritishacademy.ac.uk/documents/1002/12_Parzinger_1836_Final_0.pdf
This temple has recently been restored:
https://astanatimes.com/2023/07/resurrecting-ancient-glory-experts-restore-baikara-temple-in-north-kazakhstan/
On one hand it would allow to add more civs.
On the other hand the existing civs might be downgraded to some degree when they are merged into an umbrella civ.
Well that is to a certain point always going to happen in a historical game like this; players will be introduced to new concepts that might sometimes confuse them at first.
There are already a few civilizations that are not very well known, or different from the stereotypes some people might have (IE Ptolemies instead of more stereotypical Egyptians like in RTW, Romans in the vanilla game based on the Republic).
They are separated from the Britons.
Not sure if there is enough differences between the Germans to justify something similar (compared to Suebi, the Cimbri seem more nomadic, more influenced by Gauls and with heavier equipment).
It would be interesting to have some bronze age cultures from Europe.
Although a lot of it would require speculation due to the lack of written sources.
Since there are no known figures from those cultures, the heroes (if they have them at all) would have to be based on generic archetypes (high priest, king, great warrior...).