For the Queen Elizabeths, what if instead of deciding that a 25kn top speed was good enough, the Royal Navy decided to try making their battleships faster, but also hedging their bets by building a battlecruiser as well? Thus, build 3x Queen Elizabeths, (QE, Warspite, Valiant), plus a fourth funded by Malaya (Malaya) and instead of Barham, a scaled up Tiger (Leopard) armed with 8 x 15" and a 30 kn top speed. She'd without a doubt be a big girl, something like 31 000 t standard, and around 800' long, but using all oil firing, she'd still be able to make her speed on direct-drive turbines with steam supplied by large-tube boilers.
ETA: And, instead of the Revenges, a repeat of the above, another 3x Queen Elizabeths and 1x Leopard.