Been thinking about this too. These folks (http://pathlesspedaled.com/2011/03/touring-bromptons/ - scroll to bottom) put MKS Lambda grip kings on their Bromptons - 1 normal, 1 quick release.

And the place that did it for them (http://clevercycles.com/blog/product...ur-brompton-2/ - scroll midway down) offers Lambdas and other pedals as upgrades to the Bromptons they sell.

And these (http://www.evanscycles.com/products/...7#BVRRWidgetID) seem to get good marks as a compromise between full clips and nothing.