No. A ticket is an ordinance violation, not a criminal charge, so the constitutional right to jury trial does not apply. And as a matter of simple logistics, States do not allow every person who wants to fight a traffic ticket get a jury trial.
Additionally, banking on winning on jury nullification isn't a smart idea. You can't argue nullification to the jury, so you would have to hope and pray that the jurors know that its an option and decide to apply it to you. If you argued nullification the Judge would shut you up and possibly start a new trial with a new jury with an appointed counsel (at your expense).
And on top of all that, if you did take it to trial after the cop decided to be nice and write you a lesser ticket than the one you should have gotten, the prosecutor would charge you with the original moving violation and dismiss the seatbelt violation. So now you aren't even hoping for nullification on the seatbelt issue, you are hoping for it on lane deviation charge, which no juror is going to nullify.
Edit: The Supreme Court has ruled (in 1895 in the case Sparf v. United States) that there is no right to argue nullification because juries are supposed to decide on the facts of the case as applied to the law as it exists, not to ignore the law. And 49 of the 50 States (New Hampshire is the exception) expressly ban the arguing of nullification to the jury.
And I already told you what will happen if it "slips out", the Judge will shut you up, instruct the jury to disregard the comments, and potentially dismiss the jury, start a new trial, and appoint an attorney (at your expense) to handle the case since you have proven an inability to follow the rules of procedure.
But its all irrelevant anyway, because you do not have the right to a jury trial for traffic tickets.