That's interesting. We have to abide by our Ops Specs, and we are required to be on a straight in by 1,000 feet agl, unless its a charted visual such as the river visual, expressway visual, etc.
A visual approach clearance does not relive you of your responsibility to comply with 91.126 through 91.131.
There is nothing in your (or my) OpSpecs that authorizes any deviations from the direction of turn requirements of 91.126 through 91.131.
You (and I) must comply with both 91.126 through 91.131 and our OpSpecs.
Nothing about joining final at no lower than 1,000' AFL conflicts with, or overrides, 91.126 - 91.131. Nothing about that affects how you get to being on final at, or above, 1,000' AFL.
The Boardman violation, and subsequent NTSB decision, shows that when conducting a visual approach we must still comply with the direction of turn requirements of 91.126 - 91.131 and establishes that a straight-in approach, which is allowed by 91.126 - 91.131, must begin outside of the normal traffic pattern for the airplane in question. If your last turn to final is not in compliance with 91.126 - 91.131 then it must be made outside of what would be a normal pattern for your airplane. Since you are required to be on final no later than 1,000' AFL you would have to make that final turn sufficiently outside that point to demonstrate that you are outside of the pattern.
What I do, if my last turn is not IAW 91.126 - 91.131, is make my turn outside of the applicable final-approach-fix for the runway so that I am established on Final by the FAF. In the unlikely event that an inspector questions my actions I can point out that I was established on final prior to the applicable FAF and was performing a straight-in approach.