In another subthread I came up with the below, is this what you mean? I haven’t tried it yet.

• /home/user/folderApple is always empty
• /home/user/folderApple-original mounts ontop of /home/user/folderApple at boot
• then /mnt/drive/folderBanana also mounts ontop of /home/user/folderApple when/if it becomes available (later in the order)

Ideally I’d like to avoid a script because my experience is they aren’t very durable. I make mistakes and they are difficult to troubleshoot. So I am trying to just use the tools that are already available in the system.

But maybe there is something in the idea of using a second mount, like if

• /home/user/folderApple is always empty
• /home/user/folderApple-original mounts ontop of /home/user/folderApple at boot
• then /mnt/drive/folderBanana also mounts ontop of /home/user/folderApple when/if it becomes available (later in the order)

The results are the same no matter which order I do the mounts in.