I'm not a teacher; but I have some suggestions:
"Do you want" sounds not so polite. I'd rather use "Would you like" or "Do you like".
I think "but you live overseas" is redundant in the sentence because the listener already knew where he/she are living.
Maybe we can add "without travelling" to highlight the point:
Would you like to buy something in Hong Kong without travelling personally?
How about "We can shop for you."?