Hi there!
I use Keynote nearly exclusively in all my academic conferences, and as such I consider myself not only an expert at presentation design (slide, transitions, and animations), but I am proficient at transferring Keynote to Powerpoint and Prezi (as I've had to do this a number of times, unfortunately). While I don't know the specific content of your slide—I'd like to see a sample if possible to give you a better estimate—I believe my extensive experience in Keynote makes me an ideal candidate for your project.
This will be my first project on Freelancer, so I am ultimately negotiable on the price and timeline. While I believe that quality can't necessarily be forsaken for turnaround time, I figure this is a good situation for you to get a quality freelancer and for me to get my foot in the door here. Let me know if you have any questions or concerns, and I'll be happy to respond!
Regardless if I'm selected or not, I do hope you find someone who can successfully fulfill your Keynote project! :)
Regards,
Cody