Do you have a link to a retailer of those noseall? They look interesting. Do they work similar to those keyless chucks which only have one 'barrel' part?
i'm not sure how they work, but they rely on the spin from the grinder to tighten them.
they do clasp up when the wheel catches though.
i use a pair or adjustable grips to free them in this instance.
with regular or ordinary use, blade changes are easy - almost fun.
they ain't cheap either.
the one i have is over 11 years old. so old that the finger-grippy splines on the wheel edge are worn smooth and shiny. good investment but don't abuse it.