Finding a variety of fluorescent-colored craft fur wouldn't be a 'cherry pick' imo. There's not a lot available from, or produced by, any one manufacturer that I've seen. Hareline-Dubbin, Inc.'s Extra Select Craft Fur would be what I'd check for first. Targus Foxx Fur and Doug's Bugs Craft Fur Plus are no longer manufactured. Occasionally, they can be found on eBay or at a 'hideaway' fly shop.
Rainy's is another brand of craft fur that might have something available. I checked the Bee Head Craft 'Hair' over at Punisher Lures and couldn't find any named fluorescent product.
Steelhead fishing/tying suppliers may have proprietary product that anglers who don't fish for them may not be familiar with. Could be worth a Google search or two.
Have never found any really bright long pile colors at fabric or hobby stores or at their web sites online. There could be something available in 'faux fur' though, which also might warrant a few Google searches. It's basically the same material with a different name.
Be aware that not all synthetic hairs are alike. For example, there are big differences in flex and feel between products termed fish hair, fish silk, and craft fur in my opinion.
Edited to add: Might check Orvis Polar Fiber. It's good craft fur, though it's not cheap. It, too, is likely limited in the variety of fluorescent colors offered.