Mobile and desktop user 'crossover'

Hi guys!

First time asking a question, usually someone has asked them before but i couldnt find this one..but I bet its a common problem.
I have a presentation im doing for a huge client base (public elearning) and our selling point is 'reachable to all via mobile or desktop' , the problem lies in us using drag and drop functions (obv this isnt supported for mobile (not the way our developers have done it anyways so its a defo no no)).

We basically have produced two presentations - one for mobile and one for desktop (they are the same presentation just differing on about 5 slides due to drag and drop issues) but is there a variable or something where i can say: if mobile dont use slide 56 use 57; and if desktop dont use 57 use 56; so i can just publish one presentation and its all looked after? Im worried that one late late night working on it i accidently publish and make live mobile for desktop and..well you know the rest!

I hope i've explained this clearly, and any help would be great, or advice.