If you happen to have the time:
Unit name: Brunswicker Uhlans or Hussars
Unit type: Lancers or Hussars
What unit do you want me to replace it with: Lancer or Hussar respectively
What Faction: Prussia
Pictures needed
Spoiler
Lancer
Spoiler
Hussar
Oh my god. Instead of Brunswicker, that should so be a Warsaw lancer/hussar unit. The infantry and cavalry can be recolored a few times to match the appropriate regiments, the commanding general changed, and this as the sapper (yes, this is historically accurate):
(On the right, ofc)
...you could make a pretty swanky Duchy of Warsaw faction.