You don't seem to get through a lot of film, so why not just buy a notebook and write the details in it?
As for date backs, they stopped making cameras sometime in the 90's - with a few exceptions - and so the date range available won't last long. I've one or two that can't be used for this reason.
What you really need to know is the date range of them all and that might be difficult without seeing the instruction manual before buying.
Also, I remember some of my cameras had to be returned to the makers for the back's battery to be removed and replaced. Others had a tiny rechargeable battery inside (as computers do) to store the dates but they often fail due to their age, life and usage.