If you can find an Ultegra 6503 FD it might work because it's built for a 10 tooth difference between the big and middle rings and a 12 tooth difference between the small and middle rings.
My experience with TA rings is that it may be difficult to get the chain to drop over the teeth due to the thickness of the teeth at the tips. If you have this problem filing the backside of the teeth can help a lot.