We're actively working on the ability to run multiple processes with different images because it's something people using our platform want and it just happens to also be something needed for us to make FKS a more standardized Kubernetes offering.
Kata has a guest image and guest agent to run multiple isolated containers [1].
[0] https://katacontainers.io/
[1] https://github.com/kata-containers/kata-containers/blob/main...