Closing enbd devices

Is there a way to fully close enbd devices? Stopping enbd-client only
seems to stop the device from working, it stays open and can't be reused
with a different signature (the symptoms leading me to that conclusion:
The messages from enbd-client on trying to reuse, and the reports
of /proc/nbdinfo).

Yes, I've read the gotcha on the webpage, but my use case is different:
Using enbd with LTSP to connect remote devices on clients. I have a
daemon script on the clients checking for devices, and a service running
on the server which can register or unregister devices, thus device
assignment is automatic.

While I could hardcode a signature, I had the understanding that more
than one connection to the same client with the same signature is not a
good idea? (It doesn't run the stat services though, so if you say it is
safe then fine). Dynamically assigning signatures that are hard-coded
per device adds unnecesarry complexity to my device registering
protocol.

If I could just close the devices I would be happy (any messages I can
send to /proc/nbdinfo perhaps?). Running 2.4.32pre (thanks a lot for the
-m switch!).

// Dag Sverre