x100 is nice yes, but I think it is a bit presumptuous to assume Awoken Kirin wouldn't be able to compete with it. There are more S tier leaders than Awoken Ra. If Awoken Kirin becomes S tier, I'd very much regret feeding an already +297 one away.
If your idea was used, I'd feed her away immediately. It doesn't even fit any of the rest of the Chinese Awokens.
I kind of posted about this:
"AS: current gravity skill, 1 turn cooldown reduction for other skills
LS: x5 when matching Water, Grass, Fire, and Light. 30% damage reduction for Water, Grass, Fire, and Light.
Active skill would still be kind of trash. But her leader skill could turn her into one of the best defensive monsters, with a very nice x25 burst. Would such a LS put her back towards the top again? I think it might fall a little short, but I'm not sure how valuable damage reduction is.
Someone also argued that since it is 4 elements, the damage reduction would be 25% rather than 30%."
Why exactly wouldn't x25 and 51% damage reduction from Light,Water,Fire,Grass fix her? x25 is still a very high multiplier. And many of her subs have access to prongs for damage. It won't be Lakshmi damage, but it should be respectable enough.