sfi flex plate loose, help

So what would be wrong with hardened washers? There's lots of room in there, and the washers will pull the bolts back a tad, away from catching on the rear walls of the engine.And it neatly solves the problem at the root next to the heads.
I'm not sure though if I'd want to reuse those bolts tho, as ,if they have been jammed into the crank on the shanks, theres a good chance they or the threads in the crank may have been damaged.