A few problems with that.
First you would need congress to enact it which they won't do.
Secondly the disqualification clause only applies to current and former federal officials, state officials, and military officials.
The president isn't listed meaning you would need to go to the Supreme Court or get 2/3 of the states to amend the amendment.
Thirdly, none of that will happen before the election takes place.
Fourth, you would have to convict Trump of an insurrection and there aren't even any charges yet.
It would take years to resolve.
It looks very doable to me.