Regarding Elektron>Reaktor control…I’ve done this before via Ableton Live. It has been about a year (and I’m maybe slightly intoxicated…), but as I recall I had to assign Reaktor knobs in Live, and from there I was able to assign CC from the OT through Live. I don’t think I had any luck trying to do this directly (and I know it didn’t work trying to have the OT intercept R6 because it needed a CC to latch on to), but setting this up in my DAW was easy-peasy. As an added bonus, you can send the crossfader CC from the OT (CC#45 IIRC) to Reaktor for some additional fuckery.
I don’t have an OT any longer, but if anyone needs clarification I can try setting this up with my MDUW or MNM sometime this week to work out some kinks or discrepancies to make up for my shoddy memory (don’t take weird, unresearched drugs, kids).