Not sure if this has been discussed before but I can see threads on the oversensitive throttle issue which is slightly different to my query. I find the throttle has too much travel and wondered if there was a quick action tube or anything else that could be done to shorten the travel. When you open the throttle you seem to have to twist it a bit further in an unnatural wrist position to have it fully open? My sled is fitted with Ducati heated grips by the way.
I don't know what the throttle set up is on the desert sled but can't see it being much different then a 900ss, probably wrong, my point is i have a fast throttle cam on my 900ss and this could fit yours, mine is the one on the left. http://www.electraeon.com/throttlecam.html
As far as i know, no. It would maybe worth emailing them and asking about fitment or see if there is a UK based supplier, i've not looked but i will now just out of interest and if i find anything i will let you know,I want to put one on my 996, it has made a hell of a difference on my 900ss. If you find anything let me know.
There was this https://www.amazon.co.uk/dp/B076ZMKZ8S/ref=cm_sw_r_wa_apa_i_JKN4EbG824JW8 Not sure if it will work or not
All i can find is the throttle tubes with different sizes, i can't find a UK throttle cam supplier?? That one on amazon could be worth looking at but don't quote me on that, i'll keep looking and i would do a bit more poking about for info if i was you. A lot of info i'm finding is america based.
I am not sure what type of throttle the Scramblers have and what it is the same as, but scroll through this ..... http://www.electraeon.com/ducati.html
Be aware that the heated grips are bonded to the throttle tube. If you change the throttle tube you will lose the heated grip. With care it is possible to remove the rubber grips and replace then with aftermarket ones but I doubt if you'd be able to swap the heating element over without damaging it. You could of course fit an aftermarket element and grip to a replacement throttle tube