Hello Ayrshirealps.....the only time that I have been in the area of the Rhinns of Kells was from the parking near Forrest Lodge to get to Corserine and its neighbour....on foot.
Once clear of the forestry stuff not much of a path to reach the high ground that would be difficult ground with a bike? Of course there could be other ways to reach the higher ground here?
I recall that the high ground was plateau-like.
Regarding the better quality e bikes probably used by the guy providing the 'wind up' for the guys in the Kerin race. He looked like a middle aged person and quite relaxed on his 'sit up and beg bike' and having to wind up to the 50 kls. speed within a short distance before departing the cycle bowl to allow the sprinters to fight it out for the medals. Is it possible to get to this kind of speed on most of the e bikes
when on my old off road bike I would reckon on a 40-45 Kls. when going down-hill on the right sort of surface.