simple mechanism to override modules from master

hosts/default.nix

@@ -14,6 +14,8 @@ let
   inherit (builtins) attrValues removeAttrs;
   inherit (pkgset) osPkgs unstablePkgs;
 
+  unstableModules = [ ];
+
   config = hostName:
     lib.nixosSystem {
       inherit system;
@@ -27,6 +29,13 @@ let
         let
           core = self.nixosModules.profiles.core;
 
+          modOverrides = { config, unstableModulesPath, ... }: {
+            disabledModules = unstableModules;
+            imports = map
+              (path: "${unstableModulesPath}/${path}")
+              unstableModules;
+          };
+
           global = {
             home-manager.useGlobalPkgs = true;
             home-manager.useUserPackages = true;