The Silph Road Nest Atlas has two on the list this rotation: the water gardens area at Hermann Park, and Mercer Arboretum and Botanic Gardens in Spring. Both sound like decent nests worth traveling the distance for.
Ron Slockett Park, turns into a Machop farm, however it is a tiny park with one pokestop and one gym and it only produces 2 to 3 Machops every 20 minutes. Currently, it is not spawning Machops, but I’ll let you know when it does.
That’s probably why they spawn there. If you want a Machop nest at your local park, petition your Parks Dept. to have pull-up bars added. Of course, our local park (which has pull-up bars and a lot of other odd pole thingy stations where I can’t quite figure out what I’m supposed to do there) has only one spawn point, so that wouldn’t be much of a nest.
And hope for the right moveset. That’s the biggest disappointment with these buggers. It seems really difficult to get the ideal moveset on Machamp. Once you already have a great Machamp, just evolve those high-level Machops once. At the cost of only 25 candies, you get a great Machoke prestiger out of the deal, instead of killing yourself to get 125 candies, only to be disappointed by the moves.
I already have a 95% machamp near maxed out with counter / dynamic punch, so I will use your idea. I’m saving the candy for my new one, because 6+ per level up on a 2497cp is kind of a waste when I have other uses.