I don't know if I would say high-viz, but certainly something other than mil-issued colors.

But I've also been trying to find a PALS holster for a revolver for four years now. The military contracts are too large, and the side market of mall ninjas and airsofters is just as big, so the LE portion gets dwarfed. I don't think the manufacturer's perceive there to be a large enough market for hiker/hunter items. Everyone who's interested, we should pick one or two makers and poke them as a group.