Here is a who;le new world for you to explore.
Start reading the sticky threads and then follow the theme.
The links to the Tune ECU downloads are here and have been around for over 15 years now so nearly all models and exhaust upgrade levels etc have suitable versions. Many here online will assist and have done it many times before. A lot of threads have model specific and option upgrades to match or suit your existing or future needs.
If you do not find an offer for a cable they are available cheap generic from eBay or expensive brand name from IT suppliers. There are difgferent grades of cable quality but even the cheap ones seem to work for most users.
Google is your friend:
'LONELEC cable for Triumph ECU'
'TUNEECU for Triumph Rocket III Touring'