The chances are pretty good you can get those decals to nestle in, even after all these years. Try this:
1) Using Solva-Set full-strength (Not Micro-sol; it isn't strong enough) and a 3-aught paintbrush, wet the decal (so it doesn't shatter and blow away).
2) Take a small sewing needle and prik (apparently the software here thinks the proper spelling is only used in this day and age to provoke hilarity by secondary schoolboys) the decal through both the clear-coat and the decal itself so the Solva-set can get underneath. You might have to stab at it a few times here and there.
3) Once you see the liquid fill all the air-pockets (which is what the hazing is) put another drop on top and leave it alone.
4) Resist the temptation to press it out, even if it wrinkles up.
5) Repeat if you don't get it perfect the first time; It might take a trip or two if the original builder put a thick clearcoat over the decal.
90% of the time this works really well, 8% it works partially, and 1% of the time it does nothing for you at all, so you can't lose. The other 1% I reserve for my own protection if something bad happens
, although I personally have never had anything happen that made things worse than they were when I started.
If you have ongoing experience with a diabetic, you might surmise (on your own, of course) insulin hypos would work very well for this; a very fine needle-tip and the ability to actually inject Solva-set under the decal rather than leech it under by capillary action. (Disclaimer-I would never, of course, suggest such a thing since the use of an insulin hypo as a tool is probably illegal in California, DC, Colorado, Maryland, Massachusetts, and France. In the Nanny State such a heretical flouting of H&S regulation would have one detained at Her Majesty's pleasure for merely suggesting such a thing, so I won't mention it. You didn't learn this from me!)