I have an older Bike Friday Pocket Rocket, with vintage Ultegra 9s brifters. It is a bit of a pain to pack... Stripping stem, bars, pedals, and wheels. But, with some practice, perhaps 10 or 15 minutes on each end, maybe less.

My BF also has the split bars. There is a pin on the inside, and the split. Then the custom BF stem is extra wide. I haven't put a lot of miles on the bike, but it seems secure enough.

I'm not sure if BF is still making split bars, or if they've gone to an open faceplate and solid bars.