FYI you can drill out the valve stem holes and run regular "pull through" short valve stems if you want to.. Not sure of the ups and downs but I think it might be a plus, as they would flex instead of break off in the event of rubbing on something.. idk. plus if one ever does break off on the trail, you'd be hard pressed to find a replacement locally. My fancy stems are so low profile that I'm not too worried about anything ever snagging on them.
With that being said, If you're hell bent on running H1 Stems, I have a set of the H1 valve stems you can probably have for spares if you buy me some drinks one of these Thursday nights.