An idea For a Leona kit rework

A friend of mine and I came up with an idea for a change to Leona's kit that would make her a bit more versatile in the game. Her crowd controls stun chain is already amazing, and she has a decent peel as a support, but she has no actual defending abilities. Her W does have some magic resist and armor, but not really enough to do anything useful to help allies. Our idea was to make her W similar to Braum's E, a shield that will block 1 single attack. It would be a 2 cast dash. The first cast would allow her to dash to a certain spot and increase magic resist and armor for a couple seconds, and the second cast would put up a shield inn a direction blocking 1 attack completely. in order for it not to be abused it would have a penalty for using. A decaying 70% slow for 3 seconds and a 30 second cool down. It would also passively increase her movement speed. This would in our opinion balance Leona and make her much more adaptable as the meta has changed against the tanks' favor.