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Six 20" guns, 35 kts speed, a smattering of armour... HMS Incomparable is a silly ship, so this is really a bit implausible. But anyway.

First we need her built in the first place. She was intended for the Baltic Project, so we need the Baltic Project to be vaguely feasible. This means a weaker HSF. This can be achieved by a major fleet action early in WW1, or by just having less German construction. Let's go with a HSF sortie that goes horribly wrong in 1914 or early 1915 as this gives the Navy and Fisher more prestige, to support building the silly thing and the Baltic Project. With the HSF gutted, the GF can think of breaking the minefields around Denmark and fighting off torpedo boats and U-boats.

Next we need to keep Fisher as 1SL. This seems to mean getting Gallipoli to work. This is doable, it just needs better planning and coordination of minesweeping, bombardment and landings and and ties in well with the requirements of the Baltic Project. The additional dreadnoughts available after defeating the HSF help too.

So now it's 1917 and our 20" light cruiser is ready. Unfortunately we've already sunk most of the German fleet and another fleet action is basically not going to happen. She may well see action, but probably not against German battlecruisers or dreadnoughts. The next challenge is to get her to survive the peace. This is a big problem because, as a silly ship, she will be one of the first up for the chop in post-war savings. So we need the war to have ended earlier, with less damage to British finances. That's okay, success at Gallipoli can lead to an Entente victory in, say, 1916. Hmm, let's say an Armistice in 1916 that drags on a bit with Peace in 1917. So Incomparable still gets finished. But now we need another war.

Plus we have a problem with naval treaties. Let's just assume that a treaty sees no value in here, and hence she doesn't need to be disposed of, or that a stronger Britain isn't particularly interested in a treaty. The 1923 Japan earthquake and general disinterest will probably preclude a serious naval arms race anyway. Don't even think about converting her into a carrier either...

So the 1930s come along and some sort of war breaks out again. Let's assume Germany, if we haven't butterflied the Nazis entirely. HMS Incomparable forms the core of a raider hunting group. She spots a German pocket battleship or battlecruiser raider in the Atlantic, and dumps a 20" shell into the raider's magazine.
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