Question Shader with both forwardbase/forwardadd and vertex LightMode

Hi all,
To say I am working on a game with odd lighting would be an understatement.
Basically I want to have both "LightMode" = "ForwardBase" and "LightMode" = "Vertex" on separate passes inside one subshader.
But when I do that the pass with the vertex lightmode becomes invisible, is there a way to make this work, or is it simply impossible?

I have included a simple shader, that should draw the mesh twice on top of each other, one in vertex and the other in forwardbase, to showcase the issue