I created a new experience called "BF4 in BF6". It is above.
What makes it different:
Weapons are class locked more like in BF4. Support class doesn't have a defibrillator. Assault class has a defibrillator and can revive and heal teammates. Assault class doesn't have a spawn beacon. Recon class has a spawn beacon. Color tone is a bit warmer. Movement speed is slowed down a bit. Projectile speed is slowed down a bit. Headshot damage is increased quite a bit. Body shot damage is decreased a fair amount.
It's not a perfect translation of BF4, but it is a decent representation.
It is currently just Operation Firestorm, but I plan to add more BF4 style maps as more of those maps are added to the game.