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How big a problem is that likely to be
Depends on the magnitude of the load and the length of the lever
gbj_tester-
To attack it from a different angle, I've never heard of an external headset popping out under load, so they must be well within tolerance normally. Say the external part of my frankencup* is the same height as a normal external cup headset - it's got two press fit interfaces and twice the vertical distance from the headtube to the crown... the lower stack height is going to be what, <30mm? There must have been some really chunky headsets in the past that were nearly that long, no?
* good name, thanks. I grant you a 0.5% share of any future profits derived from this venture.
Edit: If you make the 34mm press-fit bit longer and longer at some point this thing would be so sturdy that it's practically equivalent to a normal 44mm headtube, no?
frankenbike
How big a problem is that likely to be considering you've got the stem and gubbins loading everything? Couldn't one counteract the problem by having a longer press-fit 34mm section?