Handlebar height and position on the Dakar is a compromise between seated and standing positions.
Replacement of the handlebars with alternative after market bars is not as simple as it could be, at least on the F650's due to the heated grip wiring inside the bars and the hand guard mounts. The later G Series heated grip wiring simplifies the task. Another difficulty is the bar mounting holes are offset so BMW specific risers are needed.
Bar risers are to adjust bar height for differences in rider height. Risers are also useful when fitting after
market bars of different height and rake. Bar risers on a machine does not mean the bar height is higher than stock.
Too often risers are seen as a normal enhancement for all riders, the result can mean the rider's arms are cramped when up on the pegs especially with the stock footpeg mounts.
F650GS/Dakar measurements by crossroadz, Sertao by Advrider inmate Motopsychoman, E&OE folks.
Replacement bars for the GS need 200 mm control area width for the switches etc
Renthal and Protaper Handlebar specifications
The bars are relatively high and with a large amount of rake which cramps the rider when up on the pegs.
The heated grip wiring runs through the bars and requires adaptors on the bar ends.
ABS Switch - Momentary Action, Heated Grip Switch - 3 Position Centre Off
Michnus Alloy Bars HowTo from F650.com. All credit to Michnus
The early Dakar screen can hit the bars. Sculpting the lower section of the screen allows the bars to clear the screen and reduces helmet buffeting.
The design of the bars, switches and bar ends have changed on the Sertao, the bars are noticably lower and with far less rake than the original F650GS and Dakar. The inner hand guard mounts could be eliminated by mounting the hand guards off the mirror mounts.
Install should be simple but I have not seen the details of the mounts. Any info would be appreciated.