Can’t predict that dan, but as your (Strata) Manager has asked you to follow the legally correct procedures with regard to your proposed renovations, it’s obvious to me that they at least would be amenable to setting right past oversights.
Furthermore, IF any of the previous renovators are current Owners, then I’d expect they too would be receptive to a SBL that merely makes them responsible for maintaining their past works where those involve common property areas; they probably expected to anyway!
It’s the subsequent Owners of renovated Villas that can be potentially problematic, as they may (or choose to) believe that everything’s original, and therefore some is still common property.
In any event, you’ll never know until that Motion is placed on the Agenda for your upcoming AGM; even if you have to submit it yourself!