Rep brought up a good point to me that three options would not be feasible as it would be incredibly difficult to reach a majority for any one decision. In that case, I think a poll asking whether or not the Hylian Knight should be kept or removed should be posted first. If the keep position receives majority support, a subsequent poll asking whether to keep the HKs in their current form or rework them should be posted.
To prevent people who are inactive in the community from swaying the vote one way or the other, specific activity requirements for whose vote counts could be implemented. These requirements would be incredibly lenient to solely weed out those who are never on otherwise or solely create accounts solely to vote. For example, a poll could mandate that participants have been members of the forum f or at least three months and have posted at least five times in that same time frame.
With all this being said, it might be best to delay such an option until the current situation calms down.