Here is a basic workflow for my current Lumina-Next-SFT Diffusers Wrapper custom node. Still a work in progress but can handle any latent size as input and outputs latents to be used in other nodes and workflows.

Custom Node available on manager. If anyone wants to contribute to the wrapper please feel free, would welcome the help :)

https://github.com/Excidos/ComfyUI-Lumina-Next-SFT-DiffusersWrapper.git