"But will the question of whether or not to form a Barony in the first place be put to an official poll?"
Yes this question will be asked it will be part of the Baronial Polling. The Baronial Polling will have two parts. The first should we become a Barony. The second if yes then who should be Baron and Baroness. Both questions are asked at the same time.
Also the question of who should be Baron and Baroness is also open to the input of both non-members living in the area and members living outside the area. A sample of this can be seen at:
Middle Kingdom Policy for Baronial Polling
(This is where sample of both polls are available)
This is also discussed in