My opinon is no brompton fits people over around 5 foot 8 to 9 very well in standard forms. That's why prefer the faster folding but slightly larger folded mezzo, but that's another thread!
There are threads about bromptons with santori or gubb handlebar reach extenders. These threads might give you the ridding postion you prefer. I added a dahon andros stem extender to my brommie and bull bars. This gives me a really good riding postion like a road bike. I started a thread on this, there are others. Little pixel showed how to turn the santori in to a quick release.
Another option is to use wide bull or tt bars that are wide enought to fold either sde of the wheel when folded. You need about 45 cms width bars for this. But then you do not need to add another folding stage nor do you need another type of stem.
Other mods people have included ergo grips or bar ends. Ask if you are interested and I can llook for the threads when not posteing on a smart phone.
Last edited by bhkyte; 03-06-13 at 03:49 PM.