Btw, why you recommend getting sex link chicks? I now understand that chicks at a young age can't be sex'd until a few weeks.
Most chicks at hatcheries are vent sexed, which is around 85-90% accurate. Sex links can be sexed based on color, which is 100% accurate (or 99.9% as my feed store calls it). So if you must have all females and don't mind that sex linked birds have higher production over a shorter span, then that's a way to avoid accidental males.
Personally I take the good with the bad and risk the occasional cockerel. At least there's a farm here that'll take them for dinner.