Well, from the development speed of panda3d, it could be a long time, so you should try to assign the shader yourself.
I was thinking of some method like disableShaderUpdate() which would do a very hacky thing: dump the shader itself and assign it to the node.
We could do it ourselves, but we would need to set all the shader imputs, which would still require knowledge of shaders to know what the shader accepts. And I don’t even know if shadergenerator stuff defined in the egg file (such as normalMaps) would work at all.