I
I regularly ski 188/30 FIS GS Atomics and Volkls (as well as, this year, Rossi FIS 165 SL, thanks to
@ScotsSkier ) I also have the woman's old spec FIS GS 183/23s (two Volkls).
Yes, you can ski them properly in public, if mildly careful, and if you pick your runs and areas - with no threat of tickets pulled. I'll give specifics of the areas I frequent, but you can extrapolate to your own locale.
I've had no problems at all four areas I go to regularly: Copper Mtn, Winter Park/Mary Jane, Loveland Basin and A Basin; but Loveland and most of A Basin just don't have groomers that are steep enough or long enough at pitch for these skis (whereas the FIS SL skis work fine at all four areas). Both Winter Park and Copper cater to racers, practicing all over fast, and racing in courses.
The ski patrollers at these areas look for control and slope awareness, not speed
per se, in my experience. When I am approaching them, I just demonstrate I'm in control with a few extra well-carved turns to show that I can turn, slow down or stop on a dime, and am well aware of those around me. They smile and wave, no problem (whatever speed I'm going, short of SG or Downhill speeds). Sometimes I stop and chat with them. (Sometimes they get bored or lonely just standing there keeping folks safe.)
Optimally, one wants a slope that really allows true GS turns at speed, rather than slopes that are too gradual or have only short pitches that are steep enough. (For example, at A Basin, only Montezuma Basin, just barely, has a groomer slope that works well for GS skis).
Both Winter Park and Copper have slopes that regularly have official GS, SG and Downhill courses set up on them, and are geared towards catering to GS skiers. The best runs at both places have held high level race camps (Copper & Winter Park) and/or national championship events (Winter Park) on a regular basis. Winter Park, in particular, has a top to bottom slope usually dedicated to race practice or courses, and nobody bats an eye if you are doing GS or SG on those slopes for hours - except at the bottom, where they string orange fences to slow folks down, and expect you to take the hint.