Steam on pimary SSD, game on secondary HDD?

Yes. You can use a junction to move the games folder.
You can move the entire steamapps/common folder, or just individual games. (I would just move individual if you want some left where they are)

You can also use a app like this one to do it for you.
Junction Link Magic


Essentially, You want to make a folder where ever you want the game to be.

Then move all the files inside the games folder (the one steamapps/common/ GAME) to the new folder.

Next, delete the files inside the folder in the Steam Game folder.

So you should now have a folder with the games files where ever you want it to be...
and the games folder where it was originally should just be empty.

Use Juntion Link Magic to create a juntion.
As far as STEAm in concerned, the folder is still there, even though it is physically on another drive.