Ok, after playing some time with my new setup and the modded warthog i can say it works like a charm.
the mod requires a bit of cutting at the throttle itself but if you remove the new part it works just like before:
first i did widen the notch (the one thats just right in front of the changeable afterburner thing) as i thought i'ed make a small detent piece, but then i realised that it would have to less area of support (if you want to do the mod aswell you wont have to do that). then you have to remove a bit of the curve and make a flat area for the new detent.
and this is it. i cant tell you the radius i used its a bit of try and error till you get it right:
finalised:
The detent is removeable - in theory, it has to fit snug to prevent any wobbling.
In game (Elite Dangerous) - might also work in target (i dunno) i had to set throttle to full range (forward and backward on same axis) and set a bit of a dead zone.