If someone works in the stool lab one could make kava kava agar. Will not be as easy as tomato juice agar because you need to sterilize it or make an alcohol extraction and to use that extract.
1. Sterilization by boiling might create slime and create skin on liquid -- I suspect it.
2. Sterilization with sub micron syringe filter - good luck.
3. Use alcohol extraction and resolve it in water and use syringe filter because it might still have some fungy or spores that justDontDie abd add it to the liquid media before solifification.
Compare with growth on simple agar and, say, potato agar. Maybe it gives sone in vitro information before starting any expensive stool metagenomic study
I used to work in mefical microbiology research lab for 15 years, feel free to ask.