You say you have all the "various paperwork required to register the bike", but do you have the actual certification that it has passed the SVA test??
You correctly say that the speedo has to be changed from KPH to MPH, and the tyres need to be to EU spec, however there is far more involved than this to get the certificate. Does it pass the EU emissions limits? Is the fuel filler cap height, within the acceptable clearance of the fuel tank? Are the lights and indicators EU marked accordingly?
In 2004 I imported a Bullet 500 from Goa, under the mis-apprehension that I'd bought a bargain. However I had to make various additional changes to the bike roadworthy which I didn't anticipate, in order for it to pass the SVA. (Some of these involved the above points). In the end, it was no cheaper than buying a UK spec bike!
Knowing our friends in Brussels, I wouldn't be surprised if there are even more hoops to jump through nowadays!
https://www.gov.uk/government/uploads/s ... _2010_.pdf