Good morning Brock,
I my opinion you should be able to put the scarf joint close to a post because of leverage.( one beam has to hold the other) It does not matter if it is right on top of the post or a within 2-3 feet of it. I think that right on the post might even be better because that would put less weight on either beam since they will not have to hold each other and instead rest on the post.
If it were the case that the c&t of the braces would dislocate the joint if one were to put it right on the post then same would be true if it is not. You still need to attach the beam(whether it has a joint or not)to the post via t&m. So now if the braces are putting a load on the beam it cannot dislocate.
Just my two cents.
Best Regards Enrico
