Can the other engine be used at all, for even a short use? You said it needs a rebuild that could mean it is burning oil or some other problem but still allow a quick short use.
Just thinking out O the box a bit, I probable would not want to relay on it if it could be used for docking when needed.
You can always try it on a nice calm day with knowledge of the currents at the time you will be returning to the dock.
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