Sam,
As a rated PowerPoint expert I would be happy to provide you with an hour's advice and ideas, which is all your budget allows.
I can work under a Confidentiality and Non-Disclosure Agreement if required, and can start as soon as you pay the fee into the site and send me your existing material.
I designed presentations for twenty years at a leading multinational, delivering them from Mexico to Turkey to audiences at every level from Main Boards to General Public.
Now working from home in the UK across five freelance sites, I have designed templates, and both created and improved presentations, to good reviews from international clients.
Would normally provide samples to let you judge my PowerPoint skill for yourself, but you made this a "restricted" project. I can't send you an attachment unless you send me a Private Message first.
Hope you find this of interest and look forward to hearing from you.
Bob Allen-Turl