How many units exactly does your DLC have?
If you look at my latest version, I joined them all because I used a Dispos file which allowed me to fit together a lot of units into a single DLC, you could do the same with yours and then you could give them weapons, all you'd need to do is grab the script from mine (I made that one myself actually, although I'm still not to great on script editing), which instead of giving a single unit it loads the Dispos file, then within the Dispos file they were given a spawn flag of 40 17 and the location was set to FF FF FF FF, what this does is, instead of spawning these units, it just forces them into your party.
I actually finished this College semester and am now enjoying my free summer time before next semester starts in August, and I'm basically almost finished with the Revelation Unit Buff patch and just need testing done to ensure nothing breaks.
That said, finding the model won't really get us anywhere if we can't find an AID, Human Lilith already had an AID because she appears in some cutscenes on chapters 1-3 I believe, so unless we can find an AID for Human Anankos we can't really accomplish anything, we COULD make an AID for him, but we'd still need to find his Head Model+Textures and his Hair+Textures and then Figure out if he has a Voice ID assigned or not.