Hi, I am a senior unreal game developer.
I have plenty of experience in developing a game using blueprint in unreal.
So, I can merge all our blueprints together in unreal.
Please check out part of my history of unreal.
https://www.freelancer.com/projects/unity-3d/Oculus-Room-Unreal/
https://www.freelancer.com/projects/Android/Unreal-Game-Development/
https://www.freelancer.com/projects/Game-Design/Build-game-using-unreal-engine/
...
If you want a good result, Please feel free to contact me anytime.
Best Regards.