I know this will not provide much solace for our PS5 players, however, if you have BG3 on Steam and are using a controller...
You must first enter "Big Picture" mode
"go to the game in your Steam library, click the Manage gear icon, select Manage again, Controller Layout, and you'll see listed under Quick Settings "Invert Right Joystick Y Axis"
This will allow you to invert Pitch (Y axis)
"Note that that method only shows "invert Y-axis" in the quick menu; if you want to invert the x-axis, you'll have to dig way in:
Edit Layout
Joysticks
Right Joystick Behavior Settings Icon
Invert Horizontal/Vertical Axis options"
That will allow you to invert Yaw (X axis)
If these options did not exist on Steam I would not be able to play the game using a controller. This is because, even though pitch = zoom in Larian's default layout, the actual pitch itself is changing depending on the zoom distance, so when playing (because of the verticality in the area design) we must frequently aim our cursor above/below the sight line to successfully target. These are the instances where your inverts will start to feel really taxed by the controls. For myself playing for too long without inversion will make me feel dizzy, like as if I am a passenger in a car on a winding road, in need of Dramamine to keep from hurling.
I considered purchasing this game on PS5. For me this would have been a more budget friendly option, but I was concerned since there wasn't much info. For some reason only Stadia users were given a preview of what the controller schemes might end up looking like. I was willing to buy BG3 on spec for the EA, owing mainly to my deep love of the franchise, but was not willing to repurchase it on console without first seeing what that would look like.
What PS5 invert players will need is exactly what Steam provides there (although it's kind of annoying, because of the whole Big Picture mode thing, which may not be intuitive) at least it exists.
When filing your support ticket, make sure to include the word "Accessibility" somewhere, so they understand that it really is a hand eye motor coordination thing.
This needs to come under the same general umbrella as stuff like closed captioning for the hearing impaired, or font scaling/color-blindness for the visually impaired etc. It's the same sort of thing.
Some people may have grown up playing flight sims or Goldeneye, but that doesn't explain it. There are a lot of issues going into this and it's not clear why some of us are the way we are. For others they might suffer from injuries requiring them to approach controls in novel ways that may be unfamiliar to the standard user. All these things help users who might not otherwise be able to experience the game (or experience it enjoyably) to do so. It's an easy potential win and very low hanging fruit I think. I hope they will consider it in light of the many new users for whom BG3 may be their first introduction both to Larian and D&D, BG, or possibly to cRPGs writ large.