That's where the headache comes in. I bought one of these, but it's too deep and on a small frame it hits the bottom of the steerer tube .. ? and makes the whole setup look silly. Stem height is technically not an issue since I can slide it up and down, but the adapter sits way higher than it. I'm usually not too fussy but this and the fact it hits something on the bottom makes me reluctant to using it. Hence my question!

The headtube is a mere 11cm from what I remember. From what I heard here and there, and correct me if I'm wrong, but during that time they significantly sized down the height of bikes and installed bigger stems to counter that. I'm 1m74 and the bike is supposed to be a 54 as per the part number (VIA6000UFR541C9) but it measures a 52x54 with a 110 stem. Too long for me. That's why I'm not too fussed about this setup and was more wondering about the technicalities of such a fork swap. After checking around online for 1" threadless headsets, I think I will be getting a bike that measures a 54x54, easier than the swap