I can't believe somebody has not come up with a good machine for trimming. The only machine I seen on the web is slow and messy. Here is a concept, think of a reel type lawn mover, like used on golf courses. Make it 1 to 2 inch diameter, would work great. Going to have to get in the shop. Using a grass shears, I think would be kinda bulky. Probably better served with the standard scissors. Good luck.