From a Flagger's perspective, we wouldn't need (or I'll wager, get) fully staffed volunteer turn stations for non-racing sessions.
The OTD's run well on a rather short staff, paid with WHRRI Bucks I believe.
I'm not sure how to meld those 2 worlds together, especially since we would need a quick turnaround between the racing / HPDE sessions.
The PCA races I've Flagged incorporated them into the schedule as just another Group, but all those 'working' the event were paid to be there.
Maybe set them up as the last sessions of the day, and the additional staff not needing to be there could migrate to the turn 6 bleachers ???
Just my 2 cents,