First of all, how will you get a copy of WOWOW transfer? Second, it doesn't contain as wide a framing as the laserdisc versions do!
Some of the CG scenes are better in the HDTV versions, the WOWOW version is also such a master used for the HDTV and the BD maybe as the framing is very similar.
You can definitely use WOWOW source for TLWJP if its open-matte (1.78:1) and not 1.85:1. For the 1.85:1 BD version is already there!
Only if you are thinking of using the open-matte source, use the LD audio, otherwise it'll be a waste of time and money(electric bills)
Is the WOWOW source for both JP and TLW open-matte? If you have it, then please send me a screen-shot of the last scene when the Rex roars inside the lobby!
About the Colour-grading, none of the previous home-video versions have the right colour!
Only the 3D BD has the more accurate colour-grading, apart from a few shots! So, the 3D BD should be your reference point!