Should be easy enough, you would just need a locking spacer to hold the headset adjustment, then you can take the ahead stem off and insert the quill stem. Play around with steerer length etc to keep it looking ok. But remember to check the steerer ID and wall thickness, if these are not right then there is a risk of the quill stem wedge damaging the steerer tube.
'Height adjustment', oh yes, they'll like that! Yes, it's for height adjustment!
So, I was thinking that'd it'd be really neat for stuff like height adjustment, looks and also it'd make people go "You're not quite right in the head, are you?" and out of pity they'd get me stuff from the supermarket.
Mickey, am I right to assume you mean that I have to take care of where I wedge the quill in relation to where my collars are? That's a good point.
why do they always have to come up with good reasons to -not- do stuff, we wants to do stuff!!!