This rear wheel would be absolutely fine on the track because you won't be applying any backwards pressure at the velodrome... It's strictly verboten...
However, on the street you will be, and no matter how tight you reckon you've got the sprocket on or if you've stuck a BB lockring on there as well and then Loc-tited the shit out of it, it will still fail when you least expect it...
Probably when you're on one of those big hills you were talking about...
Agreed, only it's not a BB lockring.
http://www.miche.it/en/catalogo/catalogo-miche/pignoni/ghiera-chiusura
and it's made out of cheese.