Hyperdrive Bundle - if I already have a char 7 stars

Keep the stars, no shard shop currency.

There are technically no shards in the bundle. Your current shards are merged with the bundle contents to the point where the character is at 5*.

The HB post is pretty clear, found here: https://forums.galaxy-of-heroes.starwars.ea.com/discussion/220084/hyperdrive-bundle-details#:~:text=Players%20will%20not%20collect%20duplicate,or%20the%20player's%20current%20collection

Relevent section:

The HD Bundle is a great deal, but, honestly, the Grind from 0-85 was my favorite time playing the game.

Once you get to 85 its a much slower grind that wears on you over time. IMO.

Thanks a lot for your anwser! This really clarify my doubts ;)