Cacadores are rangers and marksmen, functionally identical in role & training to a German Jaeger. Why not use the proposed Jaeger ideas for the cacadores? I think a Gatling gun replacement would be more appropriate though; the cacadores were created in the 1800s, and persisted into the mid 1900s
Concerning the GGun part, this is exactly what I suggested in the comments of the spreadsheet if we wanted to keep the Cassadore.

Here’s what I think:
Spoiler : slaganz
Warrior replacement
50 production (cheaper than warrior)
7 CS (+1 from warrior)
Furor Teutonicus promotion (+50% vs barbarians, kept on upgrade. Does not have “Brute force” promotion)
“Native tongue” promotion - 50% chance to convert barbarian on kill
Druhtiz oath - +5 influence when given as a CS gift
I reduced the amount of influence so the AI isn’t missing out as much, and ressurrected the barbarian conversion from vanilla Germany
The only problem with "barbarian conversion" is that it is the same kind of bonus that the Huns have. For the bonus against barbarians, the only concern I have (I already had it before) it that this could lead to some unwanted situations (an authority Germany would wreck barbarians as if they were nothing, which could be a bad game design), but it could also make a tradition or progress Germany a much safer option against bbs (in short, your infantry spear line would be on-par with authority ones when fighting bbs), so I'm not quite sure how to feel...
Let's imagine how Germany would work with such a unit : you build some Slaganz in the early game, and you go beat so bbs, acquiring one or two new units along the way. Then, when you first meet a CS, you give some of these units (decreasing you military upkeep at the same time) to become at least friend with it and allow it (and you) to grow and improve easily. Until you attain Steel, you can always produce some of these units to maintain your relations and so you enter the Medieval era (and the time where the Hanse and the Teutonic order really shine) with enough elements to display your true potential (if it plays well). You must only be careful against other players, since the Slaganz isn't nearly as powerful as a Jaguar or a Scout, and only pillage with your UM when you have the number advantage (and some promotions acquired when destroying some bb huts).
PS : I'm always playing with the "Enraged barbarians" option toggled on, so I don't know if CSs even need more units in games where barbarians are calm.