Good questions.
My (unofficial) answers:
1. Since owners of DSP plugs get a UADx (native) version for free I would say the only way to get the native version of a DSP version that you do not own (when it becomes available) is to be on SPARK. Unless, they start selling UADx versions.
2. IDK, today I imagine no, but this is UAD and some 3rd party plugs have been restricted in the past.