Silksong might be one of the "easiest" ones if I ever did a RenoVK. Basically, you check the swapchain size, and any 8bit texture that the game tries to build that matches that resolution gets upgraded to 16bit. And done. That alone will get the SDR layers to stop banding. (We actually do 16bit float because we want above SDR level brightness, but 16uint would be a perfect, less problematic banding fix).

I might look at vkBasalt. That's basically how ReShade ended up building an addon system. You have to be able to inject shaders, create textures, and monitor backbuffer to do postprocess. Instead of just doing it at the end, it allows us to listen for render events and act accordingly. That's the basis for most our mods. Every game will use DX/GL/VK commands so it's much easier to tap into that instead of compiled CPU code.