So, what we could do is the following - we can provide a FOVTODKS patch which will transform ED+FOV into DKS, though if you apply it, you will not be able to load any of your old savegames. If that's what you'd like to have, knowing that your ED savegames will not work anymore, we can try to figure something out to make that a reality. It's also going to be a pretty big patch because really a lot of assets change.
FoV-to-DKS patch sounds fair, for those who have already purchased DIV ED and plan to buy the expansion.
One of the features of role playing games is their re-playability, so for those diehard fans who love to role play the game several times (like myself), incompatibility with previous saves doesn't represent a major issue.
However, one man's opinion doesn't necessarily mean the "voice of the majority" ... so let the rest of the community speak for themselves.
All best to you Larin team