Hi, Susan
I was confused by: Is this the kinda thing the Wiki can do? A tree for the graveyard?
Any tree starts with profiles of the people. The graveyard sounds like it gives you good clues for names and dates to find further proof.
As Sheila said, you can set up a page for all of them in the graveyard, and link the names in the page to the profiles as they are created. I am very familiar with her cemetery page, and can help set up yours if you'd like.
You need to find corroborating proof for life events - birth and death at least. Please ensure that you don't use the graveyard as a source without finding primary sources for the life events. You want to confirm the dates and source the profiles.
Your links here and on your profile go to a page named "House Cleaning" that doesn't appear to contain the History.
This is a wonderful idea for family cemeteries - I have a few in West Virginia that are all related to me. This might be another rabbit hole I can go down!