Duellist's Prerogative on a Bladesinger: Great?!

Hello all,

I'm theorycrafting a party for patch 8 and am considering how great this sword seems to be for a bladesinger wizard. Now we don't have the patch notes, sure, but given the 5e rules say that the bladesinger cannot be wielding a 2h wep, second wep, or shield, this rapier seems like an excellent choice. Wizards don't have rapier proficiency, but with something like a 9/3 or 8/4 split with thief rogue, the bladesinger gets the proficiency and a bonus action, which can be used with the weapons skill to make another melee attack. Like.. this alone sounds quite good, right? This is on top of finally having a great build for all the gishy gear that already exists in the game.

Anyone else have any thoughts on this weapon or other ideas?

Edit: I see now that when choosing bladesinger as a subclass, we'll probably get martial weapon proficiency. No need for rogue dip, but the extra bonus action seems great with Duellist's so I might spec that way anyway.