If your aim is to allow fore-aft and lean, with some level of input for steering, you may be headed to what I did by modifying my E-Flex.
I have a “mini rocker plate” via fulcrum and leveling springs added under the front section of my E-Flex.
It works really well and once I con enough people into trying it, I think we will see more steer and leverage combo rockers. At least for those looking to make the rider more “realistic” compared to just adding comfort.
I really need to do a quick video on how this works, because I don’t think my text describes how well it really works.