Yeah, it fits together perfectly. I don't think there is a chance in the world that the German HDTV capture would not fit with the BD footage or the transition be even slightly noticeable - the German HDTV broadcasts were the same master and were such a really high quality that the Blu-Rays are hardly an improvement, except maybe in some fast moving shots or flashes and such and even there it would take a frame by frame comparison in order to discern any difference.

Now a different thing is when you start doing some heavy manipulation like You_Too and I did, then the compression that was hidden in the dark starts poking out in the HDTV broadcasts and it looks fine in the Blus. But with the kind of subtle changes you do to the colours, OMEN, I don't think you need to worry about the transition from BD to HDTV and back being noticeable at all.

As to the colours, they look quite nice, though I would personally go a bit warmer. But that is totally up to you of course :-)