Interesting points, but a lot of these points could be fixed by creativity.
Face variations could be multiple things that would actually work well for a bounty hunter or trooper. Maybe an eye is missing or other features on this head. Perhaps eyelids are present for some faces, as they do have eyelids in canon. Even having a smooth or more rudimentary variations of skin. The skin of rodians have been known to range around in colors, even in the game itself. Eyes could be black, blue, red, or purple. Of course, they even have hair in some cases. Not a lot, but neither do the dothamir. I get there are many variations of these features of the rodian in-game, but they can add them. The Force Unleashed rodians could be a massive point of inspiration for this playable race.
Female variations would probably have a slightly smaller head and the female proportions. Not a huge difference, but that nautolan is also pretty similar is that regard.
By saying the model is already in the game, I know they are going to have to make a few changes and adjustments, but its nothing that cant be added. There are things to be added, that doesn't mean the rodians as a player model to base off of aren't usable.
Your last point, that rodians are skinny, that is true. Honestly, I could imagine that they have members of the population that are a bit larger. It is a vastly populated species after all.