Hello DavidtheMalcolm, I appreciate your feedback, I myself used RPG Maker for years and I know your struggle really well, for that reason I tried to adapt my assets to the point of literally copy/paste and start using on RPG Maker.
I cannot say that 100% of the assets on my bundle will work on RPG Maker as some are 3D or other things, but I do think that 75% of it works fine!
Thank you and I wish you good luck with your project!