... your decision sounds more than fine.
Hi, CL, I know it's not that much "en vogue" today, but I happen to like yellow gold a lot.
But, I'm picky with the "right" colour - perhaps more than with other metals. It needs to have a certain "warmth" for me - in case of the 5050 it's very nice, IMO.
And, as you rightly point out, the dial plays an important role as well, again in this case closed to perfection for my taste.
Only thing I like more on the roman dial version is the moonphase "subdial" (without the shiny golden "ring") and the missing "automatic" but that's nit picking, I'd say :-)
As for the strap, personally I'd prefer a dark brown croco - here's a pic of a NOS, still in it's plastic and a bad pic, but you'll get an idea.
Best regards
Suitbert