Recently one of the devs released software for 3digi and OpenTX integration. This allows you to tune the 3Digi flight controller from your Open TX radio. The Lua scripts are available for use in all of the Frsky radios. I have been using one of the scripts on my X12s and it is working well. One thing you will need is the the integration cable for communication between the 3digi and the SmartPort on your RX. There are plans on the link for source or you can buy one from Attitude RC.
Here is the link to the software. https://github.com/JR63/3Digi-FrSky-TX-LUA-scripts/