How to transform faster on Kayn?

Literally the title.

I've tried playing Kayn and have been doing terrible on him. his early game is insufferable, while he seems to be a pretty good champ even when slightly behind once the transformation is complete.

I realize that Kayn is supposed to have a very weak early game, in order to compensate for what the forms bring and early game's a race to finally transforming into either red or blue form. My question is - How do you speed it up so you can get out of the miserable base Kayn who gets preyed upon by pretty much every other jungler in the meta?