Can the Prestige Kai'sa skin/ Akali ever come back besides being in hextech?

It's basically very unlikely that you will get the kai'sa / akali skin from hextech unless of course you own every skin except them and I really want to get the skins. I don't mind doing them for missions or anything but I don't want to depend on some crappy RNG system no offense. Could any rioter perhaps could answer this?
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