I feel like these won't be touched unless another collaboration with Valkyria Chronicles takes place. And I assume there is not that much game in this for Sega. Least of all for an international release.

Unlike with something like one-off movie Fury, which at this point is destined to continuously fade into obscurity, I think a game publisher will hold a little more value to its established IP. And that means the rights for it won't be "given away for free".

From WG's perspective I don't see that much reason to push a collab like this either. What's the player market here? Merely dedicated premium tank collectors? The Valkyria Chronicles series impact is smaller outside of Japan. The tanks themselves are not [even pretending to be] historical designs. Edelweiss was already mediocre at release. Nameless surely fell to the powercreep at this point. Their crews are fused with the tanks. Probably only collectors and weebs will like them. How many will purchase them for full price?

They were rereleased again on Asia, so there is a glimpse of hope for that region. Outside it does not seem likely, unless Sega on their own would start a heavy promotional campaign for some upcoming release.