We have the raster braille kit, I've seen quite a bit of hate towards the system by
sign shops online and i've never understood why. the kit and licence is not expensive to buy, I think it's around $2000. we paid for the kit about 3 times on the first job we used it on.
My understanding is that the "braille insertion pen" is that actual part that is patented, not the process of putting a bead in a hole, you are free to drill a hole and put a bead in it however you choose to, but the pen makes the task must quicker and repeatable.
Like I said, i'm not sure why there is so much hate regarding the raster method, it's just another tool in your arsenal.