Yeah, I think a BubbleBum would be very unlikely to cause much damage as a projectile.
If I were in your position, another option I might consider (no flames please! :duck
, would be to rig up some sort of
loose attachment to prevent the booster from being a projectile. I can't remember if the Ambassador has a shoulder belt adjuster (or how it connects if it does have one), but I'm thinking something along the lines of taking an old LATCH strap from another seat, and attaching it too the booster where the shoulder belt adjuster would attach (assuming it's not needed). Then attaching the LATCH strap to one of the LATCH anchors in the vehicle, being careful to
leave some slack in the strap.
Obviously, this would be
against the manufacturer's instructions, and NOT something I'd tell anyone else to do. But
I'd consider it, if I were in your position. :twocents: