I had a similar problem with the rear water plate bolts. Snapped 4 clean off in the block.
I ended up drilling through 3/4 of them, tapping a size up with no helicoil. The 4th one I tried using an easy-out, which snapped off in the bolt. I dont have anything that drills thru hardened tool steel. I ended up welding a nut on it, and it actually unscrewed the bolt after a few nut attempts. I put a thin layer of silicone on both sides of the gasket, I never want this to leak ever again.
I ended up drilling through 3/4 of them, tapping a size up with no helicoil. The 4th one I tried using an easy-out, which snapped off in the bolt. I dont have anything that drills thru hardened tool steel. I ended up welding a nut on it, and it actually unscrewed the bolt after a few nut attempts. I put a thin layer of silicone on both sides of the gasket, I never want this to leak ever again.

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