If you keep drilling alternative bolt patterns into a flywheel the centre will eventually fall out!
All flywheel manufacturers say don't redrill flywheels. Is this to protect their market or you?
Rarely will all 8 holes pass through vergin metal as one or two usualy interfere with an existing hole.
If you've ever seen the end result of an exploding flywheel you wouldn't even think about modifying one. I've seen it once and don't want to see or hear of it again.
Legs are something I use to drive me car. I wouldn't like to see one removed by a 10kg piece of metal slicing trough it.
Besides your legs you also have a gearbox and tailshaft no longer attached to your engine and starting to whiz around in circles plus a floor pan that's perforated like a colander.