I would try to save your current flywheel.
The aluminum likely "creeped" into the gap between the bolt hole walls the the crankshaft flange bolts. You can greatly reduce the chance of that happening again if you press steel sleeves into the bolt holes. The sleeves would need to be about 1/32" shorter than the hub thickenss to ensure you clamp the alumimum and don't bottom out on the sleeves. Once done, the sleeves would support the walls of the bolt holes and greatly reduce the chance for any further creep.
I would also try to find some hardened washers that will fit in the resessed bores. These washers would spread the contact load across a larger area vs the small stepped ring on the underside of the bolt head. Just need to check for clearance between the bolt heads and the clutch disk hub.
[This message has been edited by fieroguru (edited 07-23-2013).]