Welcome. Beware that cnc is quite a rabbit hole with lots of new stuff to get to grips with and a significant cost to entry....as you have started to discover! The advantage of a oozenest workbee or Shapeoko is a sizable active community to support you and an entry price about as low as practical but still around £2k (remember it is not just the machine you need). But if you look at their forums you will see there is still a lot of tinkering required.

Two suggestions:
If it is marquetry, then you should look at lasers as they are much better suited. Some people even manage with a Critcut machine.

If you are serious about your art, then I would first look to develop your processes using a contract cutting service or local machine owner you can pay for their machine time. Then as things develop you will know what you need and decide whether invest. (As a furniture designer/maker that is exactly what I did, and even with my own machine will still use them as appropriate)

But then if you like process and are obsessed with having your own robot slave...like.many of us.....just accept you have an expensive hobby and dive in ?