Paul Strand was famous for varnishing his matt prints for added brilliance.Dead matte papers look great behind glass because you only get one reflection, whereas with glossy papers you'll get two. Glass also increases the apparent dmax and contrast of the print, but you'll lose the charcoal drawing look.
While categorized as a glossy paper Galerie is less so. Galerie's paper support tint is not as bright-white as ADOX Fine Print Variotone Premium VC FB Warmtone. The image tone is just slightly warmer than MGIV fiber. The paper surface is attractive and smooth.
What happens if you lightly tone Galerie in Agfa Varadon? Is Varadon still available? I have read Varadon is a polysulfide toner so there may be something commercially similar if Varadon is not produced.
Where I'm going with my toning question is the possibility of using Galerie and introducing a hint of tonal complexity warmer than selenium toning without obvious tints of pink, red, green, yellow.
This link may be useful to folks