Only way I can see it beneficial is cuz drug use among schizophrenics is pretty common, using kratom is probably safer than using most other stuff. I’ve met few schizophrenics who keep smoking weed, even convincing themselves it’s good for them, yet it sometimes triggers their symptoms.
Be aware that just about any drug can do that. Even drugs that could usually be used to calm a psychotic patient can in fact trigger psychosis in some, still kratom is probably among those that have minimal chance to cause that. Ofc drug interactions are another problem that doesn’t skip kratom either.