Invisible Blade gets feint as a swift action. The weapons also fit swashbuckler (although, admittedly, they aren't quite as big), but a rogue/swash/IB with daring outlaw isn't that bad off.
Eh... Unless you use the author's fix, I don't think Invisible Blade is worth taking for anyone. It's at odds with itself as-printed.
Could you be more specific about how it's at odds with itself? Could you also post a link to the author's fix?
Sadly it was lost in the WotC forum. You can still find scattered references to it in Invisible Blade discussion, but I haven't been able to find a complete quote.
It consisted of:
-The invisible Blade was originally designed to be a 10 level prestige class which improved throwing as well as stabbing, but the throwing abilities were cut when it was reduced to a 5-Level PrC
-The pre-req's should thus be changed to Weapon finesse and Weapon Focus (Dagger/Kukri/Punching Dagger), cutting the throwing-related feats
-Unfettered Defence works with Light Armor (because it's capped by class level, it was stronger on the 10 level class)
As far as being at odds with itself, I was referring to two of the entry feats (PBS and Far Shot) being basically useless to you, and completely unrelated to the PrC. The change to the entry requirements lowers the opportunity cost of the PrC significantly.
This is the closest I can find, but since it no longer has the author's name attached, whether or not someone believes it's the author's fix is an issue.