In my opinion, no. The trick to fencing in En Garde is really a matter of strategy and resource allocation -- there's no room for the die-rolled resolution of BRP (or most any other RPG for that matter). I've tinkered with the idea myself before, but never came up with anything satisfactory that worked better, or even as well, as the system contained in En Garde itself.
Now, what you could do, is graft BRP onto En Garde to handle skills other than fencing, but once you have a look at games like Vatican En Garde, you'll see that EG can handle social skills neatly, too.
If you're really in a mood to swashbuckle with BRP, I'd strongly suggest digging up a copy of GURPS: Swashbucklers and adapting Stephen O'Sullivan's tasty fencing schools to d100.
!i!