Hi. Kings Canyon "Resort" isn't fabulous and pretty expensive, but it's fine for a couple of nights. The pool is refreshing and bathrooms could do with a spruce up. Sites are all under trees. The walks into Kings Canyon however are incredible. With 2 families, the boys did the longer rim walk, while the girls (youngest was a spritely 6yo) did the southern rim walk (about 5-6km) meandering up a ridgeline and still had a great view of the Canyon. You can't go any further here as the bridge is one way, but the main rim walk is a loop. Worth it I reckon. Not sure what the Kings Canyon Station stay is like, but Wikicamps had pretty good reviews. It's tar all the way from Yulara to Kings Canyon - you have to backtrack about 120km along Lasseter Hwy then head up Laritja Dve. One pit stop on the way that's only just bearable.
From Kings Canyon, you'd probably head back to Alice (about 4.5hrs) on the tar, and then from memory (April 2018) it's tar on pretty much the whole West Macs loop. Roads into the Glen Helen Homestead are dirt but easy 2WD and not long. New bathrooms here too and the homestead has a ripper view for happy hour and good basic food. Can do daytrips from here to many places.
We didn't go to East Macs so not sure how far bitumen goes - Ross River I think.
Aileron on the Stuart worth a stopover to see the Anmatyerre Man and woman & child. Red Centre Farm has excellent mango icecream and snacks. Devil's Marbles has $7 camping and though road in is dirt, it's fine for 2WD. Daly Waters has good food at the pub (didn't stay) and Mataranka def worth a couple of days. We stayed at the Homestead. All ok with 2WD.