"how do I mount this thing on a bike that is not a Brompton?"

Brompton uses a carrier block bolted to the headtube;
using two holes on the frame arranged in a top & bottom pattern.
I'm not sure if drilling holes on a non Brompton would be enough.
On the B'ton this holes are beefed up with extra steel.

2013 Brompton DA chainring Ultegra chain by 1nterceptor, on Flickr

Sunset New York City by 1nterceptor, on Flickr