Indeed, a pretty in-depth timeline for each planet might be a better way of doing things, and then the current timeline can just provide a cosmere-wide perspective.
It might even be possible to plug some code into mediawiki (I know, I doubt it too) that formats each planet as a line and lies each line out relative to each other. With points on each line linking to event articles and such. That'd be superduper far down the line though, if ever.