I would STRONGLY discourage you from using a "clipper laced" belt unless its only temporary. Yes it is less labor to install especially if you machine is in line with other equipment and access to pulling the bed assembly out is limited. However what is not taken into consideration is the damage the metal lacing does to your conveyor bed plates. As the metal lacing drags across your bed plates, you are creating friction, metal on metal. Its even worse when you load material on that seam. Now your forcing the metal lacing to create more friction on your bed plates from the pressure of your pinch rolls as well as the abrasive belt. The cost of grinding or installing new bed plates is not pretty. I have had customers spend thousands of dollars to repair the damage these belts create.
Depending where the separation is (on the rubber surface or on the canvas or both) will determine the repair. If the entire seam is separating, any repair you do will be temporary, In my experience once a weak spot is created in your conveyor belt, it's only a matter of time before it completely fails due to the tension used to keep the belt tight to the feed drive roll and also the"pressure" you create when sanding material. If the damage is only related to the top rubber layer, you can try cutting the delaminated/damaged area away and using silicone as a filler. The silicone will be pliable enough to follow the radius of your feed drive and take up rolls.