I don't quite understand what you are getting at, seems like you are making it more complex than it needs to, just as Sony does
my setup is different to
@Bobsyeruncle but we have the same ideology. I rarely change my AF settings thanks to this feature.
So my camera is almost always set to AF-C, realtime tracking with medium flexible spot (sometimes for larger subjects I use tracking zone and expanded flexible spot). This is pretty much a permanent fixture and tbh works for static subjects too especially if you are going to focus recompose because realtime tracking is great at keeping the subject in focus even after you recompose.
Then I have AEL button set with "Recall Custom hold 1". So pressing and holding this button simply overrides the AF-C to DMF and also autofocuses using DMF (i.e. I have AF-on ticked and focus mode ticked set to DMF). all other setting are left the same. DMF gives me peaking, plus the chance to manually override the AF with MF (really useful in the dark for example). The rest of the settings remains the same. only two things are overriden in my case.
View attachment 307420
simples