For fast touring, just get a mid range road bike (Shimano 105 level) like an RC 520 from Decathlon, a Giant or one of those UK house brands like Sonder or Ribble.
Then get a full set of bikepacking bags (big saddlebag, framebag, handlebar bag and maybe fork bags and gastank bag) to suit your budget. I.e. from Roswheel at Aliexpress, Woho in Taiwan up to Apidura or Revelate. Lots to choose from.
Work out hydration, food, sleep and shelter. Lots of info on that available. Check out the Trans Am racer loads etc. Even look at the tailfin system.
Be warned, though. There was once a bitter internecine conflict in the touring subforum between proponents of fully loaded touring and light touring. This rears its head at the mention of certain types of drivetrains, when posters will issue angry fatwahs against 1x setups. Such arguments only ever lie dormant around here, it doesn't take much to fan the embers into a brushfire.