@Dan_Knight has put in some effort to get a DietPi image for the Allo Sparky that I have now managed to get onto a 16GB SD card and hope to try in the next 24hrs.
I believe the updated build is now on the DietPi Downloads page here
http://dietpi.com/#download
Not sure if the Allo Wifi dongle driver is included but fingers crossed this is a great starter for Vana or Kali and Piano owners with Sparky as an SBC platform.
Thanks again Dan