This is about your personal comfort level with risk - only you can decide
My thoughts.
Guilia has been out now for >3yrs, there’s lots of anecdotal internet data in about failures. I’m not really aware of any on the Veloce, are you?
Your car has done less than 10% of the mileage that Alfa Australia warrants (risks) themselves. The warranty in the US and the UK (same car) is 150K miles or a little over 240K km .. so make that 5% of the risk Alfa Romeo (car maker) is comfortable to expose themselves to. What makes you think you will have a significant failure some 5% into the life of the vehicle?
$3K for a extended warranty seems a lot to me - is it Alfa, or a product from somewhere else (what are the conditions/limits/catches). That said, If you trade in to get a new car (warranty), the cost of depreciation is bound to cost you ten times more. Let me know if it turns into a Stelvio in Misano blu with sunroof

I’d be inclined to keep the car and “risk” $3K.. but then I’m comfy with high mileage Alfa’s, they’re reliable in my experience (no big ticket items). Maybe spend $3k on an electric bike (Specialized) and leave the car in the garage, I walk/jog more each year than you drive

I’ve not been any help, sorry
TLDR: Keep the car or if you just don’t use it, sell it before it depreciates even more - either way, it’s very unlikely to throw a big bill. And you can always ask Alfa to update software if Bazz etal can’t get access to updates. In my experience indies are very resourceful, better than dealers