They can make Rand female, black, Hispanic, Arabic, etc. But to make him Asian would be beyond baffling. The fact he isn't Asian, that he is different than the rest in looks is part of his story.
Absolutely no chance Marvel makes him Asian. It's as likely as casting a male for Captain Marvel.
I think the white guy who's "special" in a crowd of Asians is now a little insulting in how much it has been done to death. See the Netflix series Marco Polo. Funnily enough, he was the blandest part of the show.
Instead of "white guy looks different than us Asians LOL" why not, Asian guy looks the same, but is not. That is interesting and mirrors real world struggles.
Or whatever, make him black or Latino if, for some reason, you really want to cling to the "he looks different" story point. But I don't see why he has to be white when it's a terrible trope.
And just for the record, I would still be happy with a white Danny Rand (as long as the series is good). He's no Human Torch to me. But it would be nice to not see a retread of the white savior trope. It would be nice to see a powerful Asia-American male lead character in the MCU. And it would be nice to see a storyline that doesn't just use Asian culture as a backdrop, but also delves into how that culture affects those caught between two worlds.