I'll remember who's paying when we meet for a round, Sam!
The steerer on my bike is uncut too, but I had to take a fixed n'lock because the only adjustable one available was white. But even on top of an uncut steerer, I needed something more to make up for the height lost by going from an adjustable stem to a fixed one, and from bars with the right rise to bars with a few millimeters less, and then I grabbed some more to adjust for the stiffer back that comes with advancing age, and all in all, I ended up with the stem a good 60mm above where it was mounted previously, limited more by cable lengths than by the quill, which still has plenty of adjustment left.
You of course know your own requirements best. But what happens when people get a Rohloff is that it becomes their all-purpose bike and their other bikes get neglected. (I haven't ridden another bike for three years; my other bikes are now in the loft, three floors up and I'm thinking of getting rid of them). If I were you, I'd get the quill the right size for the Rohloff bike and leave myself a good bit extra on the cables, give them an elegant fat curve, because another Rohloff effect is that the gearchange ease makes people want to sit more upright because cycling requires less effort, so that the bars creep up quite a bit more than you would expect, especially if your background is as a derailleur roadie. You can always buy another quill adapter locally and relatively cheaply; I like the one made by BBB, but Kalloy types, including a crude but safe one with a built-on toollessly adjustable stem (1), are avialble on Ebay.
Andre Jute
(1) I have a workalike, more elegantly designed and built by Royal Dutch Gazelle, that came as standard equipment on my Toulouse.
http://coolmainpress.com/BICYCLING.html I set my ton-up (truck-assisted) speed on an upright Dutch City bike on 38mm Marathon Plus, which chez Jute is a
narrow tyre, by not even flipping my North Road Bars upside down, but simply dropping the adjustable stem to an acute angle with the steerer, and rotating the handlebars until the grips pointed almost straight at the ground, which, with some saddle height adjustment, brought my back down to perfectly horizontal for aerodynamic gain.