Re: HOT PINK/BLACK LEHNGA!
The other option is to save this cute color combo for a slightly less important day -- one in which you can get away with wearing a lengha that is mostly black and not as heavy. Then you can do a black lengha with the hot pink accents and he can have his black suit with hot pink shirt/tie (I personally think the shirt sounds great). It won't look "too much" if black is the more dominant color and the kaam isn't too heavy on all the clothes.
PS: The Karma one is gorgeous!