An allen head? I have had good luck in the past getting stripped allen head bolts out with an appropriately sized torx bit. I guess it depends on how stripped it is though. When I bought my old dirtbike, I went to put a new sprocket on it, and found all 6 allen head bolts were stripped to the point that using an allen head wrench was hopeless. I found a torx bit that fit into the corners (what was left of them) of the allen head on the bolt, and ran them out no problems.
This is why I updated my block drain plugs with fumoto quick drain valves and did the updated water separator drain plug. Op you can try the Torx bit trick but if it doesn't work take some jb weld and fill the hole on the drain plug and stick the Allen bit in and let it set up completely then try again. You will need to either replace the drain plug with a new one or spend the extra money on a fumoto valve for it. As well as replace the hex bit.
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