Maybe
Grant, and others,
The jury is still out whether or not a slider can even be opened in flight. No one has said on here that they have done so but one guy bailed out of an -8 that was on fire in flight a few years ago so he did manage to open that one. Unfortunately he had no chute.
We have a slider and yes, an axe in the event of an off-field tipover. With that said, I'd try really hard when down to 70 MPH or so to open it some anyway. Whether or not I could do that, I too, would like to know.
As far as bailout during acro, how likely is it that you'll ever remove the wings? It's been done but those wings were tested to have endured more than 9 g's before they broke. With some good acro training, there should never be more than 3 or 4 g's pulled anyway, way under Van's design strength.
Regards,