[ioannis]

I'll have to try every solution more extensively to find the one that requires the least amount of assembly knowledge, before I mark best answer.

I have already tried Archer's suggestion that gives me a pointer inside LdrpCallInitRoutine function at the red line below, so now I need to figure out how to change the function to call and return from my function pointer.

_LdrpCallInitRoutine@16:
7785998C 55                   push        ebp  
7785998D 8B EC                mov         ebp,esp  
7785998F 56                   push        esi  
77859990 57                   push        edi  
77859991 53                   push        ebx  
77859992 8B F4                mov         esi,esp  
77859994 FF 75 14             push        dword ptr [ebp+14h]  
77859997 FF 75 10             push        dword ptr [ebp+10h]  
7785999A FF 75 0C             push        dword ptr [ebp+0Ch]  
7785999D FF 55 08             call        dword ptr [ebp+8]  
778599A0 8B E6                mov         esp,esi  
778599A2 5B                   pop         ebx  
778599A3 5F                   pop         edi  
778599A4 5E                   pop         esi  
778599A5 5D                   pop         ebp  
778599A6 C2 10 00             ret         10h  
778599A9 90                   nop  
778599AA 90                   nop  
778599AB 90                   nop  
778599AC 90                   nop  
778599AD 90                   nop

I've also tried Carbon's solution but for some reason the following simplified code is failing on me at "SymFromName".

if (SymInitializeW(g_currentProcess, symbolpath, FALSE)) {
        DWORD64 dwBaseAddress = SymLoadModuleExW(g_currentProcess, NULL, L"ntdll.dll", NULL, (DWORD64)ntdll, NULL, NULL, NULL);

        IMAGEHLP_MODULE64 moduleinfo = { sizeof(IMAGEHLP_MODULE64) };
        BOOL bInfo = SymGetModuleInfo64(g_currentProcess, dwBaseAddress, &moduleinfo);

        TCHAR szSymbolName[MAX_SYM_NAME] = TEXT("LdrpCallInitRoutine");

        ULONG64 buffer[(sizeof(SYMBOL_INFO) +
            MAX_SYM_NAME * sizeof(TCHAR) +
            sizeof(ULONG64) - 1) /
            sizeof(ULONG64)] = { 0 };
        PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)buffer;
        pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
        pSymbol->MaxNameLen = MAX_SYM_NAME;
        BOOL symfound = SymFromName(g_currentProcess, szSymbolName, pSymbol);
}