Hi all - I have a category 5 certificate that I don't think I'll be able to use anytime soon.

I know some people have tried to convert this to points, which marginal success. I am going on a trip recently, that has several category 7 hotels - has anyone had some luck calling and using the certificate and only paying the difference with points? (i.e. 10,000 MR points to bump up 5 to 7).

Thanks!