Yes and yes - without support you can still run the ZD1100 on 9.10, you just cannot upgrade it further.
You can even downgrade it to 9.8.3 if you wish. In fact, if you do not need any of the features or AP support introduced in 9.9 or 9.10, I would suggest downgrading to 9.8.3 since the 7363's will run better with the lighter code. Just keep in mind that if you do downgrade to 9.8.3, you won't be able to upgrade to 9.9 or 9.10 again unless you have active support.