I'm really happy that my comment meant so much for you guys. Thank you and fingers crossed regarding the game. What i wanted to tell you guys about is a tool that i stumbled upon these days and i remembered the troubles you've mentioned in the post, there are some automated tools that do a decent job of porting full scenes from one engine to another (you can search on YouTube as some people test it out and share their thoughts as well). It might require some work after the scenes get ported but it'll still do 90% of the job. Here's a link to the tools that i mentioned: https://relativegames.gumroad.com/ (i am not affiliated in any way, just wanted to share this as it might help in your line of work). Cheers!