Dutch, I would personally go the dealer route, reason being.... the last time your in thare to correct the problem, this leaves a paper trail,
for you to fall back on if the problem persists. KTM updates their maps, I hope? It is not like this is a new problem for them.
I think the dealer mentality is.....When in doubt,,, fake it... or act dumb, like it has never been noted before.
This is the way things were handled at the auto dealers I have worked for in the past.
As you duly noted you have read the threads, I am sure you had seen my lunacy in thare. My local dealer does not have the ktm special tool.
They also have no intention of getting it, and cannot be held legally accountable by the ktm to have it.... I know the $300.00 is alot of money !!
to save a life or 2