Agreed, use a 6 point whenever you're working with a 6 point head.
You really want to try to avoid using easy outs unless they're the last option. In a case like this, if I can get at it, I go in with an angle grinder or a dremel and grind two sides to give me a good solid surface to get a wrench on with a VERY firm fit. Yes, a lot of penetrating oil too... spray, wait 20 minutes, respray, wait 20, respray. If no good there then hit it with a torch right before you try the wrench.
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