who said the inyan of wearing a shaitel is so that people know the person is married? maybe the inyan actually is for the woman to cover her hair?
(obviously, something very long and attraction-getting is not tznius, but not because it looks real, but rather because it is attracting attention to that person, just like bright make-up, certain clothing,etc.).
i’m not a rav, obviously, but i think people have to realize that there are halachos and we do not have to add to them. if someone, for themself, with husband’s agreement, feels that it’s not tznius for them to cover their hair with a shaitel, then fine. but, there are so many other things that we MUST work on (like not doing aveiros and our middos), that it seems silly to add a chumrah when the essentials are not being done.
disclaimer: if they are living somewhere where people do not wear shaitels, then it IS untznius for someone to wear a shaitel in that particular community.