As a seasoned Full Stack Developer with over 6 years of experience, specializing in C++ Programming and Unreal Engine, I am confident that I am the best fit for your project on calling gameplay functions externally using C++ in Unreal Engine 5. I have extensive knowledge of the Unreal Engine 5's architecture and API calls which will be vital to successfully reverse engineering your project and making the function call you need.
Moreover, my proficiency in C++, along with my understanding of UFunctions and external function calls using GObjects, GNames, GWorld, ProcessEvent, makes me well-versed in triggering and debugging gameplay functions from a memory perspective. Your mention of the use of an SDK dumper resonates deeply with me as hunting down details from game structures is something I've successfully done throughout my career.
Lastly, I've encountered similar situations where in-depth knowledge of memory management and low-level programming including ASM proved essential. Therefore, I'm confident not just in developing a Proof of Concept for you, but also ensuring a deep understanding evolves between us which will help implement the solution as per your requirement without needing DLL injections. Allow me to offer my skills, experience, and passion for problem-solving to deliver successful results for your project. Looking forward to discussing this opportunity further with you!