Yeah this happens frequenty - when I realize I need have a process one level further into a chain. The only current way is to save a temperary preset of the unit (or entire chain depending on the situation), clear it, add a mixer and then within, reload the preset.
a big wishlist for me is a chain and unit clipboard that could be used to cut/copy/paste. I have so many junk preset files to use for this inbetween process!
It would be a huge time saver building complex patches with similar chains with slightly tweaked parameters.
I tend not to solo or mute mixers, so I’ve been leaning more towards custom units as you can have all the local controls within. And for building a set of processes that you use frequently, if it’s self contained in a custom unit, you can build all the “go to” parameters as controls and then this “module” is easily loadable into any process you’re building later.