I fitted one of these in place of the charger socket on my C3 Picasso, currently have on in my MX5 too.
Good bit of kit, and gives you an extra USB socket for charging etc
https://www.ebay.co.uk/itm/383986439246

The only “wallpaper” currently shown is the Citroen logo on the start up screen, it’s only there for a few seconds so replacing it would hardly be worth the effort.
Just my opinion
As mentioned before, you can mirror photos, but I don’t believe that is what the OP wants.

If, like me, you turn the stop/start off at the start of every journey, save a bit of time, touch the car icon on the bottom right of the screen at the end of each journey before turning off the ignition, then that screen will be waiting for you when you next start up. No need to wait for “module lo...

Well done, worrying thing to happen.

I have just fixed a battery drain problem caused by a dashcam, so charged my battery overnight, today my stop/start worked at a roundabout, I wondered what was going on!
Have now left the setting screen on so I can cancel it straight away when I next start up.
A pain in the backside.

I would have thought that increasing tyre pressures would have resulted in a firmer ride? Less flexibility in the sidewalls...
But I agree, changing pressures can make a difference, as can different tyres at the same pressures.
What make of tyres do you have fitted.

Why do you want Citroen to know where and when you go everytime you drive your car?
If our government announced that we had to fit a black box in our cars to track our every journey there would be a public outcry.

I had a problem with the door check strap on my drivers door clunking/clicking when I opened or closed the door. Dealer rejected my warranty claim saying damage caused by high wind! Took the matter up with Citroen using videos and photos, they too rejected the claim saying it was not a manufacturing...

I have a conundrum and would be interested in others views. I purchased a 2019 1.2 110 Flair last year, I have suffered since purchase with a clunking drivers door check strap, but left it until the car went for its second service a couple of weeks ago. The dealer rejected the claim for a new strap ...

Same on my 2019 Aircross Flair, came across it whilst hunting for fuse boxes.
Thought it an odd location.