I have no experience with lightburb or grbl
I do all my design work in Corel Draw and then transfer to laser. Theres a free program called Inkscape that you can design in and then transfer to laser. Don't know what format these diodes need. I don't think any design software is super easy to learn, they all have a big learning curve from what I can see.
looking at this pecker 1 you guys know that for about $400 you can get a Co2 40 watt laser engraver cutter that will do all you want to do and more and probably easier to learn . Theres a ton of people on here using co2 and will be more then happy to help you thru the learning curve. There not hard to use and do a better and faster job then any diodes. just my 2¢