Yes, you can play GTA V without the Rockstar Launcher.
Yes, you can play GTA V without the Rockstar Launcher.
You're on the right track thinking about alternatives. Since you don't want to install GTA V, checking if the launcher still functions through a custom shortcut is a good idea. If it does, you might be able to get the game running without reinstalling. Otherwise, leaving it uninstalled is a safe choice.