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Your wiring diagram of tail and front turns look good. Are parking lights and taillights the same?
are you referring to the wiring diagram that I made up? Where the rear lights go to the taillamp terminal and the front parklights go to the parklight terminal? I think there are two separate terminals on the light switch for these but they are on at the same time.
If this is not what you are asking, please clarify.

I also considered the option you discussed. It seems like it would work just as well to connect the stoplamp wires to one terminal of the dual filament and the taillamp wires to the other terminal. Then I can use the one single filament bulb for the turn signals. The only thing I would have to change in my wiring diagram is switch which terminal the taillamp and turnsignal wires go to in the rear lights.
Does that sound right?
Thanks for the input