How to trim between wood floor and circular opening for spiral stairs
I would make a polygon (24 - 1/2x2 cut at 82.5 degrees + wood glue + a lap joint for strength) that can then be cut into a circle and maybe routed with a detail. You would see the grain changes in direction, but that wouldn't be a deal breaker to me. It would be a bit time consuming with all the cuts and glue up.

I've also seen videos of people using PVC trim and a clothes iron to bend long thin strips and it seems to work very well, but I've never tried it.