You could go Gloomstalker, any dex fighter fighter, or shadow monk.
Nothing duplicates a rogue's sneak attack, or a BG3 thief's 2 bonus actions a round (although there is an item in EA that lets a character get an extra bonus action when they're at 50% health, or something like that). If a BG3 player doesn't care about sneaky sniping, then it's no big deal if no one in the party can do it. For me, it's a "must have."
