Isn't the instrument cluster the same as the 1200GS?
If so, look at this:
<iframe width="560" height="315" src="//www.youtube.com/embed/LqK-Q5p9qVk" frameborder="0" allowfullscreen></iframe>
The text is in italian, but if the pictures are not self explanatory, I can translate it.
I just recently imported an HP2 Sport from Italy (and still waiting for the reg number...). Regarding headlights and speedo, you are dealing with VOSA/VCA not DVLA.
They are a bit... well... hmmm pedantic.
In my case I had the digital dashboard reprogrammed in miles from the BMW dealer in Rome where I bought the bike. Once the bike was in London, I replaced the headlight with a new one from BMW (450 quid!) had it installed when the bike was MOT'd by a third party mechanic.
You'll have to send over the garage invoice where they specify the work done to adapt the bike to UK standards.
They refused my first application because the description wasn't clear enough (the mechanic just wrote "headlights changed to UK spec").
We amended the invoice specifying that the entire headlight was replaced with a UK one
with the beam dipping to the left and they where happy with it and I got my mutual recognition certificate.
In my case we, for the speedo, we also had to specify that was
permanently reprogrammed by the dealer though a standard feature of the bike.
For everything else, refer to the thread in the "source of all wisdom" section
Just double check that the details on the invoice are up to VOSA liking... maybe give them a call and read it out to them before submitting.