Use Brompton BWR 3-speed hub to create a full 700c wheel? I have been looking at getting an internal gear hub wheel for my commuter. I currently ride a fixie and I find myself wanting a lower gear at stop lights and a higher gear in straight aways. Basically I want two speeds: fast and something comfortable from a stand still while I get to fast. I would hate to end up adding a derailleur so I'm very interested in internal gears.

I have ridden several bikes with Nexus hubs and I'm generally underwhelmed with the gear ratio. I was researching hubs and found the Brompton Wide Ratio Hub (3-speed) which has a gear ratio of ~246% (according to Wikipedia and JohnSAllen) which is significantly higher than other 3-speed hubs. Normally the BWR on a Brompton bike would be paired with a 2-speed rear derailleur, which makes the ratio go to ~305%. But I don't care about that. I want the hub.

I can find the BWR for sale online, but as far as I can tell nobody has put one on anything other than a Brompton 20-inch wheel.  That seems like such a waste. So I'm wondering whether it would be insane/impossible to build up a full size 700c wheel with the BWR hub for use on my converted road bike commuter.
A Brompton rear hub has a non-standard over-locknut distance of 111 mm, I think. A single-speed bike probably has 120 mm. So you'd need to cold-set the frame.

Sturmey-Archer (which I believe makes the Brompton hub) also makes a 5-speed hub that has about the range you want, although from what I can tell, the OLD on that is longer than your rear triangle's spacing. So again, you'd need to cold-set the frame, although less violently. Their other 3-speeds should fit 120-mm rear spacing.