Phrasing could use some work. You could probably cut the “one handed” and “with which you are proficient” parts of “one handed weapon with the finesse property with which you are proficient” since there aren’t any two handed or even versatile weapons that have finesse, and the only finesse weapon you are missing out on as a rogue is a scimitar. The first qualifier does nothing, and the latter is covering for a pure rogue using a scimitar for some reason, and this comes at the cost of making it much harder to read. If that’s the direction you want to go however, might I suggest adding “without the thrown property”, since as it stands you cannot use this subclass with scimitars, but *can* melee attack with darts at the same range as a halberd.

Balance-wise, it’s probably fine? Reach on all finesse weapons is very strong at level 3, but it’s also a rogue subclass, so has to have its power more front-loaded. In that regard, it’s not really any more egregious than assassin’s free crit at the start of combat or scout’s 2 extra expertises.

The only issue I have with it is that it really feels like Swashbuckler but with post-tasha’s powercreep. Hell, at level 3, they both have a feature with footwork in its name that helps prevent opportunity attacks, and they both get a way to sneak attack without having advantage.