We don't have any spare T45s. The T22s might do for a short-term gap filler until T26 could be delivered, but that's all. Our credibility in the ability to deliver T26 on time is questionable, because of the state of our industry & what's happening to the RN's shipbuilding schedule. We don't have a supply ship we can point to & say "That's what we can sell you". And the Brazilians can buy any carriers they want from the French, who'd be overjoyed to build them. The Italians would also probably be keen, but have the obvious drawback that they've never built a catapult-equipped carrier.
As for Bays, we're only getting rid of one, not a couple, & we have other potential customers. All the Brazilians have to do to get it is to offer us the right price. They've been happy to do that for other ships.
We don't want to trim the speed of CVF, as it's already slow for a carrier. We can't build any without shipping blocks around the country until we've cleared QE & PoW out of Rosyth, as it's currently the only dock big enough & with the necessary facilities. Regenerating another dock is still possible, I think, but would add to the cost.