Just mount their individual Documents, Downloads, Pictures, Videos, Desktop, etc. folders.
You could use Seafile (custom server and client) or something like NextCloud (actually just WebDav server and client) to sync those folders. Works perfectly on laptops and if you sync, you don’t need a good network all the time. (And since the laptop is a personal devices, you only sync 1 user or maaaybe a small number)
tomcatt360