Summary: Since GDM 3.36's UI is influenced by Elementary OS's new(ish) LightDM greeter (the GNOME foundation had turned to Elementary Inc. for this, the same people had worked on the UIs), I was hoping to be able to use the Elementary LightDM Greeter (it seems to be more useful than slick-greeter, plus it should work better with Plasma than GDM (I confess, I use 4 DEs on my computers)).
The issue at hand, is that we need a few additional dependencies for this, that are not currently packages in Solus:
liblightdm-gobject This was taken care of by lightdm-devel, Apparently it was not installed, despite the fact that I was sure it was.
If this idea is not completely rejected, I shall post a separate package requests for each of these dependencies.
I assume that there will be many others who will like to use this greeter, since it both is very functional and looks good.
Latest version (5.0.1): https://github.com/elementary/greeter/archive/5.0.1.tar.gz