I’ve made some headway but still need help if anyone is able…
I’ve been editing the CSS of my child theme to simply set the display property of the items I want to omit (eg ‘blogs’) to ‘none’ so that they do not show up.
I have also used this to add the logged-in-user-specific links I want to my navigation bar:
which now displays. I don’t have fine control over it, eg changing the text or altering the order, though I can live with that. But, my CSS trick of locating the element’s id and setting its display property to none doesn’t work in my drop-down menu.
It seems as if I need to actually have bp_get_displayed_user_nav() return a different list than it does by default.