When my kids were younger, we ran a lot of 20# and 30# braid on a variety of spincast reels. Power Pro and Daiwa J braid mostly.
Works great, but I don't know about dropping down smaller than that. Needs some diameter to function.
Also keep it soaking (as in dripping) in reel magic or another line conditioner.
They mostly threw topwater and plastics with an FC leader. Braid is fantastic on redfins and other wake baits. Once in a while I've thrown some of the lighter wake baits on those set ups. Fat girls and Hondas, lol.