Jake Niall, in The Age today, said that one of the options the AFL is considering is very similar to the article a couple of posts above. Apparently, the higher seed of each final matchup could have their choice of the current venues.
They did point out that the GF could not be held in Perth under the current border restrictions, unless there was a bye before the GF, which is probably unlikely when they want to end the season ASAP. But WC could choose the Adelaide Oval, for example.
So after the siren goal at the Adelaide Oval against Port to win the premiership? Sounds good to me.