No and I can imagine why.
Bosals, all in all, are advanced piece of equipment, more expensive than say a Little S hack and you have to know how to use one too. They don't offer a lot of lift, plus there's long reins on them and you have to tie them off, which the horse could step through or it could come undone which would be disastrous at a high speed.
S hacks, ed wright hacks, and similar are just a much better option.
Pssh.I didn't pick up the wrong lead
It's called a counter canter...
...A very advanced maneuver.