I don´t think there is, once you compile a kernel it becomes a binary and the .config file isn´t copied. You actually need the sourece for the kernel which would contain the .config file. I´m making some progress on the kernel, but right now I´m working on a drm issue the kernel compile failed on.

My hope is that if we can get a working kernel, we´ll be able to find a init method to test it with and can go from there. Once I get it to compile all the way, I´ve gotta figure out the next step would be in trying to get a 2nd-init working.