Yes, EZSkin makes it really quick and easy. You just choose your figure, choose between Firefly and Superfly, and click. I know Snarly's working on updating it (some material nodes need to be changed). It's possible to get old scripts to work in Poser 12, but I haven't checked to see if EZSkin is one of them. (I have Poser 11 as well as Poser 12, and just use Poser 11 when I want to run a script.)

Not all textures have the green tinge problem. I think it was something some vendors did to try and fake SSS. It's not necessary with newer versions of Poser, and just looks weird. But you shouldn't have to fix every skin texture.