Here’s a suggestion:
In the novelization of The Force Awakens, we get more dialogue from Snoke, and at one point (I think?) he explains how he saw the rise and fall of the Empire. So my suggestion is to re-arrange parts of existing audio of Snoke that sound right and repurposing it into new dialogue (similar to Despacito 2 having remixed audio from Despacito) explaining how Snoke saw the rise and fall of the Empire and formed the First Order. What do you think?