Jens,
Sorry for not seeing this earlier. I’ve done some work on using an Android tablet as a pendant for TinyG. There isn’t currently any way to directly feed gcode to TinyG from USB, but you could certainly do that from a tablet. You would need to determine if TinyG is right for the type of steppers you are using for this project however.
There have been many changes to the TinyG communications protocols to help improve reliability at higher speeds. The current release of my app works ok with the current production TinyG firmware, but I still need to put some time into making it work with the new protocols.
If you’re interested in discussing this more, let me know.
-Matt
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