Do you know if there are any clients for plasticscm on Nix OS ?
If not, is there a way to install the deb/rpm packages on Nix OS ?
A quick search turned up that ~lessa/verco - a simple git/mercurial/plasticscm tui client based on keyboard shortcuts - sourcehut git is available in Nixpkgs.
Getting prebuilt binaries from .debs to run usually involved unpacking the .deb and patchelfing the resulting binaries (there are a few examples in nixpkgs, e.g. the picoscope stuff.