Welcome to the forum!
The greenlean is offered with the water cooled spindle, but not the laser. However, a vertical laser product is currently offered at $6500. https://buildyourcnc.com/Item/cnc-machine-vertical-laser-xl
So it is possible, but having no experience with lasers, I would say look at the pictures and email Patrick for info. Obviously, modifications would be necessary, but would probably have to be done by yourself.
These machines are more hobbyist than production, though they will support small production usage with constant maintenance.
The GreenBull is a more mature product, has more forum support and offers the laser option. The GreenBull can be quite accurate when set up correctly. My homebuilt version is amazingly precise.
Switching between spindle and laser would be quite problematic. Electronics, power supplies are different, software, alignment issues and constant dial in. You might try going to the moon first.