I also tried to find the peak. No luck.
I'm setting my plans for the summer now and there's a very slim change I'll go to Pakistan, but the option is still there. I sent the thread starter a mail requesting more info. No answer yet.
Are you sure those co-ordinates are correct ? I see nothing near that height in that area. That Google height you give is 5749m. Google heights are usually WAY off, but there is a peak marked 5827m around those co-ordinates you give, named B21.
On the other side of the Shigar Valley there is 6400m Koser Gunge that is roughly 35 40 N 75 40 E.
Sorry, but I have to agree. It's marked as 5827m on the Swiss map as Damien says. Where did you hear about it being 6464m? There's nothing this big at the Western end of the Rakaposhi-Haramosh mountains.