Unfortunately, ALL candies are lightfast. Meaning, they will bleach out. Just like neons, glow in the dark, and other custom paints, the candies will also bleach
Some of the candy colors bleach out faster than others. You should get more than a couple years, depending on where you live, and if it will sit out in the sun.
I've never sprayed the Alsa candy so I can't comment on their product
But again, candy is nothing more than a clear with dye in it. Sounds like you don't have a problem spraying clear, so the candies, shouldn't be too hard for you no matter which line you choose.
You could always spray the HOK as either the basecoat candy or the urethane candy. Not for sure if Alsa has the same.