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A field-flattener that covers your focal-length is probably essential - even more so if you are using a full-frame camera.
The guide-scope/guide-camera can probably wait for a bit. You should be able to get good unguided subs up to about a minute long at your focal length if you polar-align the mount well.
Have you thought about things like power for the mount if you travel to a dark-sky location?
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