I don't think it is THAT difficult to change the game from real time to turn-based. I mean, come on, this isn't exactly brain surgery, lol. For example, if you had a low level fight with about 10-15 monsters in the real time original game, then in the turn based mode, cut back to around 5-10 monsters (or 6, or 7, whatever the best number is in practice) and see how it goes. The fight won't involve as many monsters, but should be far more interesting and rich in turn-based (tactically)
Or, instead of two separate low level monster encounters on a particular map, remove one encounter, and replace the other one with slightly tougher monsters, but less of them. I just think it's funny how there is a sentiment of this being so incredibly difficult to do or something. We landed a man on the moon once, I doubt this is much more complicated. (sarcasm tag for the sarcastic impaired)