To my knowledge, people were already able to import models/animations/etc at one point, with or without dedicated tools. The functionality was just removed in a patch at some point.
Relic wouldn't even need to make any more tools, seemingly, they'd just need to re-enable an ability that already existed at one point
As far as I know, this was made possible due to Corsix's Mod studio and possibly due to the fact that at somepoint, coh2 archives worked differently. In other words, right now you cant make model into CoH2 not only because you cant edit archives and replace model, but because you cant make it into CoH2 format to begin with, because they are different from vCoH. I'm not sure here, but it might be the case. Because I dont think there are tools to even get existing coh2 models\animations exported from the game and used in any 3d programm.
Nothing else is really needed except Relic allowing model importing and editing as you can see here:
Everything else you just mentioned is possible otherwise.
Thats not the point. I know about this, but the point why was turned off because of possible abuse and data hacking? Well thats the most logical reason at least. What I was saying, Relic should at least allow community dev team to work with the models, allowing archive edditing for public isnt even nessesery to begin with if there is possability of hacking something.
Relic should just allow community to do all the work model vise and then just update archives themselfs and add thouse new models.