Yes, I had reached out to "bicyclebones" regarding decals. First, he didn't know the thickness of his Schwinn decals, which I thought odd.... but I guess he just sells them, so whatever. He didn't offer to ask his supplier, so it would be a leap of faith that they'll work for me. And then I noticed a disclaimer on his listing that discourages waterslide decals being used on powder coat. I scrubbed the forums here and there are mixed experiences. My powdercoat is very smooth so I don't know if that's a good thing or not for waterslide. As I say, I really don't want to go through another 'clearcoat' process unless it's the only way.
Velocals offered .001" thick "peel & stick" and that's really thin... SO I guess I need to convince myself which is better for longevity & invisibility-- the waterslide or the vinyl peel & stick. This bike will likely stay in the garage most of the time, so I don't think weather-related deterioration will be an issue.
Although, your links to other decals has me reconsidering whether to use Schwinn or not, so thanks for the links and for sharing your wisdom! I spent a while perusing the decal offerings and ginned-up some design of my own, so we'll see---