This is indeed also a bit too far away from what HISE is supposed to be (although it would be possible to enable MIDI output, chances are great there are a multitude of other things that need to be done in order to achieve this).

But there is another open source project based on JUCE which aims exactly at what you are trying to do:

http://ctrlr.org/

You can also design custom interfaces and control hardware with it. I didn't use it myself, so I can't guarantee it will work, but it seems legit.