See https://discourse.nixos.org/t/how-to-efficiently-iterate-while-developing-a-flake-input/39784/4
One more possibility would be cp *binary-name* $out/renamed-name
in install phase for each wanted derication as stated here. https://discourse.nixos.org/t/how-can-i-distinguish-between-two-packages-who-has-the-same-name-for-the-executable/39770/3
This is also important NixOS/nix#2283 (comment)