problem with a single riser 2 way cleanout is unless you know it's there, you can end up snaking the wrong direction when the sewer is full and you can't see.
if needed i would use 2 criss crossing combys or a no hub texas twin.
ron, you're right , a san tee on it';s back will accomplish the automatic downstream direction and with a little bend, will go upstream just fine. i've used that trick too when needed.
but i've also perfected pushing a camera backwards in a comby along with a jetter and a sectional cable. it can be done when necessary.
problem with fighting the city is they don't forget. you might be right in your mind and in the code. but the inspector will remember and so will the others in the city. sort of like burring the bridge.
i've submitted bills to the building and they've fought th battle to get paid.
i once had a meeting with the city of beverly hills and even brought my own sewer tape as proof just to win a battle with the head sanitation boss. took a couple hours and all i got was a thank you and nice video. not even an apology letter. but i'm sure he heard from his superiors when i left.