Alas, it's not that simple
The xml part was a failed attempt to use a readable representation for Origin presets, we decided to not follow on this idea.
The "ogs" format is definitely not what could be used for a decent "live" Origin editor. What could be doable - but is not with the current firmware - is to use MIDI messages such as NRPN and/or sysex.
This would require on the Origin firmware side a component which is able to decode NRPN or sysex messages and map them on the internal messages coming from the hardware controls: not that hard. On the computer side it would require an application displaying a reproduction of the Origin control surface, and some code that generates the same messages when a GUI control is moved than those generated on the machine when the corresponding hardware control is moved. This application could be a stand-alone editor, or could be available as a VST/AU plug-in. That's a lot of work.
An alternative could be to use midi editor builder that enables a user to build its own GUI.