Suggestion for a possible bard buff

Hi there, I'm TheSpooniestBard, frequent visitor of the r/Bardmains subreddit and (as you might have guessed) bard main.

Currently I feel like Bard's W is a little weak, as the scaling isn't that great and bard would really only use the instant cast on allies or himself. It is for this reason that I think bard's W could use a bit of a buff, there are several ways I think this could happen.

At first I tought bard's W could be changed so that an enemy is revealed when they step on it, the problem here however, lies in the fact that bard could simply use this as a discounted pink ward (and wouldn't have much counterplay for the enemies, as bard's W is instantly cast on a location).

Something else that came to mind would be to slow enemies that step on a shrine (as an opposite of the speedboost that allies receive), tough bard already has a lot of slows in his kit and adding just a slow on the W might be rather pointless.

Finally, the solution that I came to was rather simple: combine the first two options. Say bard's W could slow targets when they step on it, while also revealing them if the shrine is fully charged! This way enemies have a clear way to counter the reveal aspect of the W while giving bard a new reason to play around his shrines during the later stages of the game.

Tl;dr: Bard's W feels rather pointless late game and is just instantly casted on allies for the MS boost. This could be changed by buffing W so that when an enemy steps on the shrine, they are slowed. If the W is fully charged, they are also revealed. This would give bard a reason to place his shrines more carefully and play around them during late game.

Please let me know what you think, would this be a good way to buff bard without simply adding damage to his q or passive?