Are you trying to ride it all only touching the trails or are you trying to cover every part of the trail and maybe use some fire road/cycle path stuff?
You can do penhydd and blue scar (i know its a blue but its loads of fun), do the whole of the Wall, then ride back up to Tramway on the wall, carry on the fire road missing out tramway and nantybar, until you come to picadilly then ride the W2 link over to Energy, keep riding past the start of energy until you come to a left turn up a hill, this will take you past the end of the black run and up to windy point. Follow the signs for blade, you can add on the additional Skyline loop if you want, then follow blade all the way round back to Glyncrowg then ride Whites all the way round back to Glyncorrwg, black run included.
Ride down the cycle path to Afan car park.
The only sections you would miss would be the 373 option. Thats it. I can map it for you if you wanted.
Hope that helps.