I have a simple but super effective Cruise Control on my 99,
https://www.ebay.co.uk/itm/Vista-Cru...frcectupt=true
There was a UK supplier but I can't find them now
Cost about £25 which seems a lot but it works fantastic so worth it IMHO.
I fitted fatter grips to my SV so sanded off the silly Suzuki fins on the throttle sleeve which also allowed me to fit the,"Vista".