Probably a stupid question, but I'm wondering if galvanized steel spokes are magnetic (I'm assuming SS spokes are not because SS isn't typically). Not really a C&V question, but I figure most galvanized steel spokes are on C&V (or at least old, if not classic) wheels.

I'm asking because I'm building up some carbon wheels (gasp, I know) for a resto-mod bike and thought I'd try tubeless ready rims that don't have spoke access holes (because I want to make my life hard). The most common way to get nipples into the nipple holes in the rim is to screw something magnetizable into the nipple, put it into the rim through the valve hole and then use a magnet to pull it to the right location. I know I could take a nipple and a magnet to a hardware store and try to find a 2 mm steel screw of the correct thread pitch, but was thinking that looking for an old galvanized steel spoke (not sure if I have any in my old spokes bin, maybe not, so this might be a wasted question) that was designed to screw into the nipple and just cutting it down to ~1" or so would do the job as well.