It may require a little vector editing beyond the scope of what CC can do, but nothing that a few minutes in Inkscape can’t fix I guess.
If I understand correctly, you want to clear out the bamboo within the black lines. The difficulty I see is that you will likely need to use a very small diameter endmill to get inside those sharp inside corners and in the space between the glass and the beer.
Do you have small endmills that will have a long enough length of cut? How deep did you intend your pockets to be ? If you’re going for the stained glass look I guess you want to pocket through to the bottom?
Pocketing with a small endmill will take forever too, and CC unfortunately does not support rest machining yet, so chances are you’ll need to either be patient or be ready to artificially add geometry to create a first set of pocketing toolpaths for a large endmill, and then a second second set of pocketing toolpaths with the small endmill to clear out the rest.
Anyway that sounds like a cool technique,I’m looking forward to seeing the end result!