RE: BMW bars...
This is my first try at uploading attachments, so if they don't show up, I apologize for this meaningless ramble.
I got the bars from another forum member - they came on his bike. The control "pin holes" were already drilled. The bars are a few thousandths smaller than the Honda bars - I put a couple pieces of tape under the control switch pods to take up "looseness". The inserts for the weights (vibration dampers) were also in the handlebars, but I had to add a nylon spacer between the handlebar ends and the screw-on dampers - the damper screw was too long.
Cables are rerouted: Disconnect the brake/clutch microswitches. The brake/clutch cylinders can be passed through the fork without disconnecting the fluid lines. The wiring harness for the right handlebar side must be disconnected under the "false tank"; then passed through the fork with the brake cylinder; then reconnected. (It'll make sense when you see it.)
The plastic piece you see in the pic is "modified" from another Honda bike - don't know which one, came with the bars. The key fits correctly, and doesn't look "too" bad.
Hope this helps.
'91 ST1100
'05 Road Star 1700