David -

The easiest work-around is to complete your braking well before the corner starts, leaving time to downshift before the corner begins. If you're going to upset the car a bit by not perfectly rev-matching, then make sure that you do this before the corner begins. So, the sequence would be:

1. See corner coming.
2. Brake to a speed that will allow you to handle the corner.
3. Stop braking.
4. Downshift. Now you can blip the throttle with your right foot if you want to, since you're done braking. If the car is upset a bit by imperfect rev-matching, then it's OK since you're still traveling in a straight line.
5. Add a touch of power to balance the car around the corner.
6. Turn in to the corner.

This will be slower than the heel-toe deal, but will be safe. Have fun!