Yeah £450M seems a bit excessive. £300M-360M seems more accurate for all 3.
Musiala will be on his last year. IF he is adamant and wants to leave Bayern, Bayern would be forced to sell at discount. City will have a good negotiating stance and can close the deal at £80M-90M max.
Rodrygo will have 2years remaining and his being pushed out by Madrid, so it puts them in a spot were they will price him at a price that can move him with a bit of ease but also profit them heavily. So I see the same price as Musiala.
Wirtz will have 2 years remaining, would want to give back to Bayer, we will probably have to pay through the nose £120M-130M.
From the £450M you mentioned, we would have £140M remaining after buying the 3players above. From that, we can get WHARTON/BRUNO G/ an 8/6 player or whoever and a KYLE WALKER replacement.
Those are 5 world class players from your £450M, with Pep and such a talented squad we will dominate EUROPE for the next DECADE!
And then we wake up from dreaming ;)