Just dropping in, I'm trying to wean myself off Mumsnet but saw my username crop up.
About doing a spreadsheet ... I can, I might even enjoy the work (weird, I know!), but I have always resisted the impulse because, quite honestly, I don't think keeping a record about people is a very nice thing to do. Memory of individual posts is one thing, keeping a record is another.
I could keep it on google sheets and just give everyone the URL.
So, if the majority want a spreadsheet of some kind, then I would do it, but if people didn't want to be on it then I'd fully empathise with that and would leave out anyone who didn't want to be on it.
Your choice.