UV labels are generally the deposition and setting of plastic, so it's not surprising that acetone works and also eats the plastic model.
First I'd try is a citrus concentrate cleaner or a product like Fantastic. It is sometimes surprising what they will remove( even layers of vinyl coating). They are pretty benign to people.
Next I'd try a magic( brand) eraser. These are available in art supply stores. Go gentle.
You mentioned rubbing alcohol as not working. That means different things around the world. In some places it is isopropyl, some places it is an ethanol cocktail with acetone in it.
In the USA, it is generally USFDA Formula 23-H (8 parts by volume of acetone, 1.5 parts by volume of methyl isobutyl ketone, and 100 parts by volume of ethyl alcohol). It contains 87.5-91% by volume of absolute ethyl alcohol.
I have seen that rubbing alcohol dissolves the labels. It's not clear which type of alcohol it is, though.
So I'd try isopropyl, Methanol, and even ethanol ( whisky)
If those fail, I'd try finding the 23-H variant ( MSDS sheets will tell you and are required for all products) and boosting the acetone quotient a bit- maybe try boosting the Ketones, too. If you are lucky, you will find a blend that works on the label and not on the model.
If you want to continue the mad scientist thing, try the brake fluid with some acetone.