Yeah tried that already unfortunately, due to the awkward shape I can't drill straight so just made it even worse.
Flatten the heads with a Dremel first maybe? You sprayed any penetrating oil down there as well? They won't have used any thread lock so it should help a little if its fused. Or can you drill from the rear back through?
@Tom13 started
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Yeah tried that already unfortunately, due to the awkward shape I can't drill straight so just made it even worse.