I suppose it depends on how much cash you want to spend on your kicks

I would think the easiest way would be to cut a stencil with your machine stick it to the glass and then lightly sand blast the for the etch (not on or anywhere near the machine

This is vinyl but there is a special stuff made for sandblasting however for light blasting the vinyl works well.
Or you could perhaps add a laser to etch the glass directly.

This is just two options but I am sure there are plenty more. Hope this gives you inspiration.
Tweakie.