@Clint There are no plans as of now to make the Link into an audio interface. If we start doing this we will let you know!
You could definitely use the midi inputs of your RME interface to plug in the Link.
For a USB hub, we have had mixed results. They don't work for updating either the Link or the Sylphyo, but some of them (especially the powered ones) work well for Midi.
Let me know if you have more questions.
Maxence
Aodyo Instruments
Aodyo.com