These are great news, Holger!
I would like to add a note:
The Holger’s “Dexed LV2” plugin is currently included in the Gorgona and Gorgonilla images. Also, it’s included in the update procedure, so when you update your zynthian software from the admin menu, the Dexed plugin is updated to the recent version in the repository.
You will find the Dexed’s source code in this directory:
/zynthian/zynthian-sw/plugins/dexed
In some weeks i hope to release the new “web configuration interface”, and probably it will include a tool for uploading & converting SYSEX files. Drag and drop 
Enjoy!