have you thought about simply using either a tunnel bag like the Givi or Bestem or any bag that fits into the tunnel area and either place a 'cup' holder or simply use some padding to carefully support any beverage container. I do this already with my Givi tunnel bag - I don't drink coffee. instead I use a 300mL bottle with a flip top self sealing lid. Works well for me.
On my Jetmax maxi scoot I've fitted a bicycle type plastic bottle holder onto the left front foot well - the difference is the angle of the front foot well compared to the 650 Burgman.
I used a standard type container mounted on the tunnel with hook and eye strips. Mounted face down with the mounting plate at the top. This was covered with a square of self adhesive carpet tile.You could also cut a foam mouse pad to glue in place. Works a treat !
As you can see there are a lot of options. Most just go with the RAM mount option but that is a little pricy.
I made my own setup similar to the RAM option. I made a mount to fit on my brake reservoir and modified a cup holder made for a boat to fit to the mount I made. About 1/2 the price of the RAM setup and works just as well.
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