@Luca haha that would be quite impressive to see…
But as mentioned, the first thing you should see if you go to the chanel monitor screen so you can see the sticks are moving correctly. So if youove the throttle stick, only.one bar is moving.
Once you have confirmed that, you just need to change the channel mapping in betaflight as per this video
Hope that helps, let us know if it does or if you need more suggestions