I think you may be chewing off a bit more, but I tend to be conservative. Get off ship at 8:30ish and remember you need to be at airport early and I am not sure how far Universal is from MCO. You can purchase an express pass for more money to take advantage of shorter lines at Universal.
As a luggage issue if you fly one of the airlines Disney works with they will take your baggage from the pier to airport and check it for you at no additional cost. We flew US Airways and this was a great service. I believe there were about 4-5 other airlines there as well, but can not remember which ones were there. I was leary but it all ended up in Manchester NH at the same time we did. Very impressive. Just to help a little and not trying to rain on your plans.