This is a fantastic idea. They'd be mad to not take the opportunity of the 20 year anniversary to do it - like Survivor Season 40, bringing back some all time great players/former winners. Go Tony!If it didn’t already feel right, the fact that April 2021 coincides with the official 20-year anniversary of Big Brother Australia is an opportunity almost too perfect to pass up!
Playing for charity softens things. I'd rather see them do it for a chunky cash prize, double a normal season. Maybe spruik a charity on the side?
Your list is really good. I have a few favourites I'd like to see return on top of that or as alternatives. Most of them have been mentioned already, like Brigitte (8), Zach (7), Mikkayla (10); and I wouldn't mind seeing Andrew 'Drew' Drew and Tully, (also 10), and Marty (2), and Rachael (5); plus Angela, SooBong, and Xavier and his knits (12).