I think they always line the toe box and vamp, right? It's only the shaft that can be left unlined..? So I remember hearing, thought not sure. In any case, some nice looking boots for sure! The black dress leather looks great on the BH.
I have never used Bick 4. But VSC will hydrate a bit and give a nice luster without darkening much or otherwise over-treating in my experience. What leather do you have? If CXL, especially a lighter version, I would go with VSC.