I don’t have an answer for you I’m afraid as I have a 595 with the 7” screen so a different system. That has an animation (before the warning message) every time the car is started or the screen turned on, it also has a similar exit animation when it’s turned off so I’m not sure why yours should be any different especially as the animation is already there.

I do know these systems have very limited opportunities for the user to amend or personalise but that’s not to say people haven’t managed to access them to make changes. I also have a BMW and ‘coding’ is quite a big scene with lots of companies offering the service of amending the systems to your liking. It’s not hacking as such as all the extra functions are already there and just need switching on but it’s still something of a dark art that should only be attempted with some caution.

I’ve often look around to see if anyone has managed to access the 595 uconnect system (I would love to amend the animation to show my car rather than a generic white one) but not found anything yet but I did find this site which relates to yours…

https://21stcenturyfiat124spider.wordpress.com/ameridans-radio-silencer/common-tweaks-that-work-in-the-fiat-124-spider-infotainment-center-7-0/#E

Not been through it in any detail as it doesn’t relate to me but you may find something there

If your ca is short time off the infotainment only resume and starts fast.
If its off over longer time (night) it starts new and longer time and show all animations.
If you want you can reboot the infotainment: press Back+Nav+Mute for 10 seconds