Definitely doable. I did the route outlined by Rockhopper...
https://www.walkhighlands.co.uk/Forum/viewtopic.php?f=9&t=66503...but I can confirm that the slog up the slope to Carn a'Mhaim is quite brutal. There was no path that I could see.
It may be better taking the longer but less ferocious route followed by WalkwithWallace, which, if I remember correctly, is also the route that a recall another WHer following.