[misfit41]

try these two easy tricks first Brent,
first one {I bet this works} drive the next size up torx socket into the allen hole,force it,,the vibration will loosen it up,it may loosen and back out.
2 ,since you dont need the plate,be really careful with a thin cutting disc on your grinder,cut a deep square screwdrive slot in the head,then try a good quality ,well fitting 3/8 drive screw driver bit,dont use the 1/4 or screw driver inserts,they twist and spring too much.
I get LOTS of rounded allens working on harleys ,good luck,Tim