That’s a perfectly legit option Hack
We are a social club and lugging around 5 sets of NTPs with tape measures is harder than 5 plastic markets we leave on the green so it works for us
I get that you feel your option is the best one but not sure why you are so dead against any other option like the one PuttOvr has developed given it solves the issue you have raised about deflected balls
I've just never seen a NTP marker on a green, or see a need for one. Not 'dead against', it just does not make any sense to me.
PuttOvr option, like any 'marker on the green', will be moved progressively closer to the hole and therefore increases the risk, the chance, of a ball landing on it and being deflected.
For your social club, how do your record who holds the NTP if you only have plastic markers you leave on the green? Do you have a NTP card left off the green?