I remember years ago using an Ultimaker S5 that could print support material in PVA. That methodology doesn't seem to have propagated to modern 3D printers (Ultimakers lineup hasn't changed in a meaningful way since 2017...). I have a feeling this may be due to a Stratasys patent on the technology, which wouldn't be surprising.
Is it possible to use PVA with the Creality CFS, and can one select what to print support material out of? I don't have a CFS (yet) and have a K1 max. But I would be quite happy to either purchase a K2 plus and CFS, or CFS and adapter for K1 if this is possible, as being able to dissolve support material is quite handy.