Just wanted to post an update for those who are curious. I called MS and was told that they could change the name on the reservation up until the day before arrival. They said I would have to be at the hotel in person to change the name the day of.
I was on hold waiting to speak to a broker, but ended up hanging up before I reached a live person. I decided to put the gamble on myself and I will see how I feel the day before. If I am still sick, I will just cancel and take the chance on booking from holding. I'm somewhat local to my resort (90 miles) and it's possible that I can get several one or two night stays before the end of May, which is when the points will expire.