Everything you asked in your original question is possible. It will require jigs for precise alignment, and will likely take a day per part engraved (at the start at least) unless you get an efficient workflow going to batch produce parts. SDJ here on the forums is the only person I’m aware of regularly doing multi-process parts with CNC and laser, he has a nice writeup on how he does it here: Some info on cnc tool changes and combo cnc/laser projects
It’s possible, but understand that the machine you order will show up, and it will require many different skills and applications to produce decent output. Usually we’re using Fusion360 for modelling and generating CNC toolpaths, Lightburn for doing laser. Luban technically can do some things, but dedicated pieces of software for each process will give much better control over the results. There are of course many other software packages outside just those two.