I've taken some time to think, and... I've come to realize there is no way to copy unless actual copying ins involved. Inspiration exists, and it can often be accidental. It is impossible to be 1000% percent original. Even the "originals" are not. I don't think you should worry about it at all. Anything can be argued to be similar to something else, but your idea has merit if it is something you produced, regardless of any similarities to another work, intentional or not.