Not sure I understand your question? Q78s ride like crap on the road, no matter what. I wouldn;t run down the road with them at 12 psi whether I was running beadlocks or not. The minimum air I would use is what every gets you right at the full tread contact patch.
You won;t loose a bead driving around town. Run beadlocks on the street. Technically they are legal, but once you cut the outter lip off the wheel you void the DOT rating. Wheels that are designed from the start to be a beadlock like the walkers, sypders, rock montsers etc are plenty safe, ust not recommended for road use because they don;t want to pay the $$$$$$$ for DOT approval. It relys too much on users understanding that they must keep the rings torqued.....so that's why the DOT doesn;t like them.
You'd likely never get a ticket for running beadlocks.....and you can always say they are fake
But get a better tire if its driven more on the street. BFGs, Iroks etc ride great on the street.