I have experience dealing with bypassing anti-cheats.
GG is packed with Themida which recently I made some tools to unpack and not just that but to devirtualize it.
I would be able to create a 100% full emulator bypass for you instead of some ugly code patching which could be a not 100% bypass.
How I will bypass it? I will first disable GG completely not allowing it to start in your game client, from that moment the protection is already off but you will be disconnected from the server.
Then I would give you a .dll which will replace the original GameGuard module and it will emulate the hearbeat functionality so that you won't get disconnected from server. I am one of the few people that I know that have devirtualized current latest Themida v3, which is the only possible way on how to create a full nice clean anti-cheat bypass.
I can't guarantee you that I will finish the project in the amount of days that I have set because all depends on the specific GG version and game that you have which could have harder virtual machines to devirtualize, it's something that I should take a look in order to say it but for sure I will finish it.
If you are interested in choosing me we can talk more in a private setting.