The thing is.. If you breed them and don't get any visual pieds, but if you do get normals with "markers", then I would save my money to buy a visual pied male to breed that female to and try again next season.

It's common to not get any visuals on a het to het breeding even if both parents are 100% het. Even if you don't get any visuals thus season and you don't breed her to an actual pied next season, just try again with these 2 next season.

Then again, if they do give you visual pieds, then any normals in the clutch will still be considered only 66% possible hets while the parents will be proven 100% hets.