The MBR killer loop you’ve linked to above is quite out of date now – some of the bridleways they’ve used only exist in the sense they’re lines on a map and are overgrown to the extent they’re impassable.
Nutcrackers / The Cleave is unchanged, albeit a bit more rocky, and has sufficient walkers down it to keep it clear. The path along the top of Hunters Tor is overgrown with bracken but passable. I used to take a horse along it to keep it open but no longer live in the area.
The ride between river and Hound Tor is still challenging and probably a bit of a carry. I remember it being excruciatingly difficult but at the time also thought I’d broken my ankle and was trying to get back to civilisation so it’s possible I’ve exaggerated a bit!
I’d have a search around RideWithGPS and consider sticking a few shorter routes together.