P: File by file Keywording during import

I have a walk around camera that I only import every month or so,

Memory cards, be they SD, CF, etc, are not to be trusted. They will fail at some point. Something will go wrong. Leaving them alone, not copying for months, is asking for it. At the very least copy them to a hard drive, and backup that copy to another hard drive, even if you do not choose to import that copy into LrC at the time.

That would be just as much work as placing the individual unique keywords in after import. That would slow down your import workflow.

During import, just apply the keywords common to the photo shoot, and metadata such as copyright, author name, etc.

Later, to select images post import and post previous import, filter off capture date, that will present you with a recent filmstrip that you can then work on as opposed to all photos.

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Another way would to have a folder called "not worked on yet" (or something you like) and import the new photos to that folder. Work on them later. 

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Or, create a collection, "not worked on" add them to that collection. Work on them layer.