From
http://www.hyatt.com/gp/en/awards/combine_transfer.jsp
"Reach your awards even faster by purchasing up to 10% of the total points required for redemption at USD$10 for every 500 points. There is a 10,000-point limit per calendar year."
So perhaps I was wrong & U should do the combining first with a note on the form that U intend to buy the last few points? I did that once & got an email from the rep. saying OK.
Etsmyers & Travelkid, perhaps the 10% limit is not enforced??
I recommend that Dhoward should phone GP for advice.