I'm not sure if this will help you or not as I didn't try it.
Try to create volume(s) with size of 2TB (or even little bit less lets say 1.9TB ) using a full DSS ( trial or licenssed ) but not the Lite. And after you create the volume(s) with that space, try to run the DSS lite and see if it works with you or not in that way.

If it works, that's great, but I guess you will not be able to use the extra space that you already have if you keep using the Lite license, unless you want to use the full build in future or the space of 2TB is fair enough for you.

Let me know if that helps you : )