How is that safer than neutral-pressure, aqueous HF? I'm perfectly comfortable with bottled HF, to the point that I literally handled it in the dark (light-sensitive samples), but I'd never set foot in the same room as a pressurized HF gas canister. A spilled HF bottle is a major incident, but ultimately straight forward to contain, whereas an HF canister leak would kill off an entire lab.

I've done enough manifold setups and worked with enough gas cylinders to understand that they can leak in all kinds of ways, even with a wealth of experience. As I said initially: you are definitely not paranoid enough about this setup.