Hi, we have wide experience in PowerPoint presentations, esp. in redesigning it.
Your description is very laconic, so we've made a bid as the only way to ask for precise your needs (now it's impossible to precise neither price nor time). First of all - what you mean "convert ... to a different design" - just redesign it or convert to other formats? Redesign = convert to defined design or going according to general CI? What about illustrating materials (photos, films, infographic: are they ready or to find/draw and accept?) What about animations?
As we know - any automatic script doesn't replace your eyes :), esp. in PowerPoint: this programm treats its own objects in different ways, esp. text. Please test copy / paste text object 1) as a template object, 2) as a single object, 3) as a text - you can get three different looks. So the result depends on - how (consequently) the presentaton was made.
We recommend working on templates (you design your own template and applying it into existing presentation) - that way you avoid "vanishing data". Template can define different type of slides and objects e.g. tables or graphs, but final touch is allways manual :).
So - we'd love to do this project for you, our team has both graphic, animators and programmist competences doing WOW PowerPoint presentations. Please give us more information, screens, representive materials to be able to precise our offer.
Best regards
Hanna Wolnik-Sliwinska