So Pete...how far did you get?
This summer I sold my KTM Adventure 990 for a 4th gen with 20k miles & no service history. The viffer suspension is shite.
After much t'internet research I'm just about to give half of what I paid for the bike to Maxton for an NR4 shock & SD25 cartridges.
For me, this option is the best value for money vs what I need the bike to do. Will service the chassis components & fit new tyres while changing the suspension. And then wait out the winter before being able to enjoy a sorted bike 😀