Step one: Make it a legally non-binding survey.
Step two: Watch people sell the survey forms.
Step three: As it is a survey and not a vote, this is probably not even illegal.
https://www.theguardian.com/australia-news/2017/sep/16/police-brought-in-after-marriage-equality-survey-forms-put-up-for-sale-online
Conclusion: There is apparently nothing you can't screw up by skillfully half-assing it.