Slap on a flex shaft instead like we used to, keep it as straight (non bent) as possible to minimize load and overheating of the shaft. It would be cool. There was a MP3DP with a laser attachment at MRRF.
The firmware will be a hybrid of the two. You’ll have to turn off the temp/extruder stuff of the MP3DP firmware, or adjust the steps/mm on the CNC firmware.