Nothing but time (or dilution) will fix over-hopped beer; brett will just eat whatever sweetness and body there is in the beer, which will tend to make the perceived bitterness even more bitter.
I guess the first thing I'd do is open one up, see if it's still over-bitter – "a few months" ought to be enough time for the hops to have significantly mellowed. You'll get next to no flavor or aroma at all (those age out quicker than raw bitterness), but you might have ended up not too far from a British ale of some sort, with malt driving the flavor and only enough bitter left to balance the beer.
Now, if you still don't like it, and you've got a carboy you don't mind tying up for a year or so, you can decant to a carboy (refrigerate the beers first! I learned this the hard way...), pitch some dregs from a favorite brett/sour beer, and see what happens. But you'll still have to wait long enough for the bitterness to age out, which will also happen if you just leave 'em in the bottles.