Thanks! I will ask DICE (nothing is lost by asking)
I also thought about asking the developers of the C64 version, since I read somewhere that they had obtained the permissions.
As far as I know, 21 Century sold the rights to Rebellion, but I do not know if they keep them. What I know is that it is hard to contact with Rebellion, I've tried it through several routes, web, Facebook, ... and they have not answer. That "lack of interest" could mean that they no longer have the rights ...
On the other hand, Cowboy Rodeo released iOS versions in 2011, but I have not found a trace of them to be able to ask.