Wouldn't it be wrong to have a vote on whether to chop a pot or not, If one person doesn't want to chop, why should there decision be negated by a vote?
Some people could be pressured into accepting a chop by others. even though they might not want to.
Here is a way to stop "Chop" intimidation.
I would hold a blind vote being .
For example; give all players 2 cards, 1 red and 1 black. Black for accept, red for decline. Then they could place the card of there choice (face down) into the vote pile. and discard the others (also face down). Then the vote pile can be shuffled and turned over. then with even 1 red card in the vote pile the game would not be chopped. You could agree to have a further votes as and when players are eliminated.
Been in a few situations where the forceful people pushing for a chop can get quite aggressive and this can and does intimidate others.