Battletech (with a new UI) would be a much better fit, since we’ve had Front Mission on console forever (and the order loop -move, face, target, shoot- is already made for consoles I think).
Seeing the Stellaris XBox interface screenshots on Twitter makes me wonder about usability. Everything seems like will take 2 to 10 times the time it does with K/M. With how long the game already is, we are looking at some veeery long playing times.