Mullwharcher is actually quite a good route to get to the summit. Yes it is a very long hike for 2 points but if you know the area quite well it is easy to avoid most of the terrible terrain. This is the route I took which gives you some of the best views.
And this is the profile for the route. As you see steep initial climb then easy-ish after that. It did take in 3 SOTA summits that day over 20km.
I’ll send the GPS route to you or anyone that wants it.
Neil