For any shot, you can choose when to use the S.T.A.D. or traditional club. You just need to agree on how that will affect your score.
Score-keeping is most often part of playing golf, so you'll need to negotiate and agree with traditional golfers.
Downloadable Rules of Safe-Tee-Air Golf (based on Rules of FlingGolf at https://flinggolf.com/pages/rules - recommended for more athletic players. )