I guess it's impossible to be accurate organizationally given the game's limitations, but here're some info to consider anyway.
Tang started out with something like 10 dao, but by the end, the number grew to about 20. Fanzhen was generic term for a military-administrative area, not a division unit. Jiedushi were either given a dao or a new administrative area would be carved out for them, called 軍 /jun/army.
Anything that was headed by a jiedushi was a fanzhen, both dao and jun. This is why some places had the word jun permanently attached to them, like Guiyi, Xuanwu, Jinghai... These things had their origins in 都督府/dudu fu, or the military office of the dudu. In critical eras, zhou would be converted to dudu fu. Hence in later eras, bigger zhou were called fu, but they were the same level. If the fu contained less than 10 zhous, it was a dudu fu; if more, it would be a da dudu fu. In the newly conquered areas, dudu fu were called 都護府 /duhu fu. This is the western protectorate in vanilla. I'm not sure about the ranking between jiedushi and da dudu, but jiedushi were certainly given a greater mandate. Annam duhu Gao Pian asked the Tang government to turn Annam into a jun (Jinghai) and him into a jiedushi.