Sounds like you have the RM set up how you want it.
If you buy the KTM you are going to have to do that all again.
" title="Roll Eyes" class="smiley">
Get an over size rotor, some decent pads and maybe a braided line.
If you can find one cheap enough , see if a KTM brembo caliper can be made to fit.
I have a nissin master cylinder with brembo caliper and 280mm Braking rotor. ( TM standard ).
Will out brake anything.
So keep the RM.