Dave:
I understand that you need something there to support the floor.
Here is how I've seen it done:

As you can see the floor is the same height as the top of the tie beam. Here he used a floor joist at the outside wall. He cut a slot into the side of the post and slid the joist in from the outside after the frame was raised.
This would allow you to support the narrow section of floor out near the wall, and allow you to move your braces up to the level of the plate where the could help support your roof load.
Just some ideas I thought I'd share with you.
Jim Rogers