Ignore me, I was being clueless. 
i had a similar question about mapping to the buttons on the dld. dan’s response from that post
his suggestion worked for what i was trying to do, hopefully it applies for yours
to be clear…
what you want to do is to be able to map physical input jacks directly to parameters (so panel knob/buttons) - correct?
rather than to have to use the jack inputs on the module?
I guess there are some use-cases where modules do not have jack inputs for certain functions. so this would be useful.
the only ‘issue’ I see here is, parameters are expected to be updated at ‘control rate’ rather than audio rate - but they could be downsampled, which is what you’d expect in your example.
note: Im assuming once we get buttons/knob expanders then these will be mapped to parameters?