Yeah that does make sense, and people knowing the potenital range of the full game is good.
I think being able to differentiate the active and inactive options in the demo might be good. I dunno if it's doable but maybe the text or background colour could be slightly different (while still maintaining a good contrast).
I understand you're balancing a lot of things in doing this though.
RE demo's in general, I have really bad memory so I don't mind playing a demo to get excited because in a few months all I'll know is 'I really want to play this' but not any of what the demo had haha. It works well for replay value and makes it less cumbersome to have just a demo in the meantime.
But some games end up being abandoned and it's sad when both the fans and author get blueballed by whatever situation makes it impossible to finish the game lol
If you are able to make tweaks like I mentioned, I'll try the demo out again, but if not, I'll wait until it's fully ready. So best of luck with the project.