I would like to see you do the RPG Maker release prior to a UE5 release, because I want to see if you can stick to your guns. Don't get me wrong, UE5 is a beast, but so is RPG Maker. Like you said, if it's easy then it's not for you. I once had a project I was working on and I decided to switch development environments. Even though the new environment was better, I missed out on what I really needed which was simply a bit more time organizing. I also thought my original environment was lesser, however this later was proven wrong due to a couple of "extensions."
Let me prove it to you. Set up crowdfunding with an initial audience of 200 on *both* projects, your current vested RPG Maker project and the green UE5 project. I have a feeling you'll get more support for your original concept.