There's a guy in Australia that posts to another forum and he actually uses watered down latex paint. Kinda like a white wash.
That can totally work , as you know . If you thin your paint you can do up to two coats and make the floor almost opaque white . I watched a painting specialist paint a floor black.The first coat of latex looked pretty blotchy but after his second coat, it evened out perfectly.
Most of us contractors hate water based stain so we use Bona white or Duraseal white and the weekend warriors use minwax all of which are solvent based . However, Minwax does have some water based products including white . So :
Sand the floor normally and apply white solvent based stain- = only a little white
Sand the floor normally ,pop the grain with water and stain- = much whiter
Sand the floor normally , pop the grain with water and coat with thinned latex = almost opaque white.