Well unfortunately it looks like I'm going to have to drill it out, I tried using some ez-out sockets and some other types of extractors etc. and it still seems to be torqued down pretty tightly so none of those tools were particularly effective.

I've been working on taking the whole front end of the engine apart today because I noticed a crack in one of the chain guides...

Needless to say my intended quick head gasket change has turned into quite a project. Oh well.

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1995 E300 Diesel - 298k
1983 240D - ~500k
2015 Porsche Cayenne Diesel - 90k
2013 Audi allroad - 153k