The picture is too small to see the exact configuration of the axles, but would it be possible to swap them left for right and vice versa, so the toe out becomes toe in?
Glider wheels would be about the right size if you were considering changing to something newer. Tost are the main supplier. Sit down before reading the prices. Skycraft do used ones, even theirs are pretty eyewatering:
Used Glider Wheels at Skycraft