But, I'd really like to see you make your case for why D55 would be a better reference point white. I don't mind you having a "preference" as long as you can support it by logic and not 'well I just like it better my way.'
The reason is that once you go down that path, you might as well have no standards at all ... and soon thereafter you're in "Audiophile-Land," which is nothing but complete anarchy and super-secret mojo that only shamans with "golden-ears" can decode.
FWIW, I spent the day turning gamut graphs over in my noggin and ultimately I concluded that the only significant outcomes from using D55 instead of D65 would be that the peek brightness of the display would be reduced which would also reduce the on/off contrast ratio. Color rendition would not be affected either way (assuming that every DVD/BD title ever released were remastered/re-encoded based on a D55 whitepoint.)
And to keep this more on topic, I can guarantee if you tried D55 on an xxLK450 you'd lose a bunch of peek brightness. Red is already running on fumes at D65.
This is not *dogma* it's (relatively) simple math and science. 1+1=2 ... 2+2=4, etc, etc. So don't try to make it out as those "stuck up experts keep trying to telling me what's right."