I ask because straight rogue wouldn't be out of place here.

Uncanny dodge, high con, and not needing to split stats between Strength and Dex as bad. Weapon choice is not a new issue and the loss of extra attack is offset by increased sneak attack damage (no GWM, so you not getting some of the bigger gains of extra attack anyway).

Respecing to Rogue entirely would net gain 2 feats over the multiclass, since your not losing the 12th level one and gaining the 10th level buff.

Soulknife also has decent means to boost ability checks. Take Athletics and maybe expertise, and you should be good at the technical aspects of those things.