Just wanted to add:
Tested it for the 5th time, works like a charm. Game started, no launcher, no update, no crashes everything seems fine. Yesterday played for 5+ hours straight, every mod worked, no crashes.
Someone may say, what is the purpose of bypassing the GTAVLauncher and then adding a rule in the firewall settings to block the launcher as well. It's just the way I approached the whole issue, just to be extra sure that if for some reason the "GTAVLauncherBypass" did not work, I would have an "extra layer of security" and the firewall would eventually prevent/block the Launcher.
Ultimately, what really matters is that it seems to be working so far. At least in my case. Let me know how it plays out in yours.