[QUOTE=T Stew; someone might know something that I hadn't found yet. 130 BCD ~50t (or slightly less) narrow-wide chainring (10 speed compatible, for 10x1 road experiment) is what I am after.[/QUOTE]

I thought Wolf Tooth would make it, but interestingly, they make a 52T in 130 bcd, but not a 50T. In 110 BCD they do make a 50T, but I assume that you already have the 130 BCD crankset.

130 BCD Road / Cyclocross Chainrings ? wolftoothcomponents.com