We are in guessing territory .. on some one elses un seen bike. any things possible

Im just speaking of a little known part offered by the company..

[For fresh17's benefit] (she doesn't need taller bars apparently .. )

older Mk 2 main section was shorter.. I used mine pointed backwards and liked the weight distribution ..
sold the Mk2 .. the longer Mk4 didn't need it , it now dutchifies my winter bike .

the designated use is typically pointed forward ..
its an easy thing to install , more so than re cabling for a higher handle bar.. for a 5 foot rider..

Singapore is not known for its winter sports as I understand.

It is true you can bring the bar in closer or buy a bar with a larger sweep. This does affect the depth of the fold. This may or may not be a problem.

When switching out bars, the recommended housing and cable length, need to be fine tuned by the user. My mistake was measuring my wife's M bar thinking it would be fine because my bar is slightly lower. But my brakes that sit further out on the bar and the angle of the cable run, actually makes the housing longer than the M bar. This is where buying my own housing and cable was a good solution. Even when I had to buy the gear shift cable and housing from a Brompton dealer, since you can't buy the cable by itself, I purchased the P version so that I had ample length to work with.

You should post a photo of your conversion it would be nice to see.

I can't disagree. The Octane bar wasn't that big a change in geometry and length from the original M-bars, so I guess I avoided most of the problems you ran into. The only (tiny) issue I had was the brake cable could get caught on the C-bag frame-handle if the handlebar was twisted more than 70 degrees to the left - highly unlikely if riding at any decent speed.

The first pic shows a cable on the wrong side of the C-bag frame handle, and could catch in very rare circumstances. The second pic shows the O-bag (which is hers, the C-bag is mine) has no such problems at all.