Honestly, sticking with scissors makes way more sense for most people. A chisel is a specialized woodworking tool, and using one on plastic or metal headbands is asking for a nasty slip and a trip to the ER. Scissors are safer, cheaper, and you already own them. That video sounds like a solution in search of a problem.

Try Type S mortar, gives me 25 minutes like @brown.angela said.

Wait, she changes the exposure on an astro cam? That's like someone adding water to a chemist's formulas because it looks fuller. Those settings are super specific for a reason. You gotta explain it's not a regular camera or you'll never get a clean shot.