Rob, I've been doing the same and it would appear that using the same Hub, which I want to do for these devices and have them attached to the Pi on the tripod, then one USB cable to a Hub on the scope. This gives me the least number of 'moving' cables.
So, if I always plug the devices in the same USB port on the Pi can I assume they will always be /ttyUSB0 and /tty/USB1, and then do I use the serial script or not and remove the udev.rules files for these devices. Sorry my Linux system skills are blunt.

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