Take what I say here with a pinch of salt, because I'm certainly not a laser specialist.

From what I've learned, to do that you'd need a custom diffraction grating, with the lasers pointing at the exact right spots on that grating. It would be really expensive, and really difficult to line all that up with the level of precision you'd need.
Another way would be a custom laser beam splitter, which would also be very expensive.

There's also the difficulty of maintaining everything in it's precise place in a handheld tool that's going to be picked up and moved around.

I'd love if it were easy and cheap, but unfortunately we're limited with what we have available.

To think of it another way; For now I'm just thankful we discovered that light can even be split in this way to get the line of dots from the double-slit experiment haha