Bibio - no grease here sadly
but I doused it in chain lube. I figured it could do no harm. I am hoping this extends the remainder of its probably miserable life, lolz. Gear shift functionality is A1 now though so I'm happy for the mean time. Shift is light and smooth. Beforehand it was stubborn. Perhaps lubing that mech up has contributed more than I had considered. I shall definitely look out for any returning stubbornness though.
I also thought the spring felt/looked fairly deteriorated. Wonder if it would be worth just replacing the entire suite...