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I'm not a fan of the GS line but people do get moist about them so who knows!
To be fair that part of the head is very easy to replace and there's not usually a whole lot of oil in there. If you pop it off and clean up as much metal as possible, then stick it back on and keep topping up the oil you could probably go a significant distance.
Not easy to find in a field but some metal duct tape would go a long way if the heat didn't destroy the glue.
You also have to hit something pretty significant to rip a hole in those. I've scraped mine pretty thin on the underside touching tall kerbs.
Boxers just fill me with dread