I have an outlet I want to control with a wall switch. Getting the switch
in will be relatively easy, but I can't figure out how to get the cable to
the outlet.

The outlet is on on outside wall and the crawlspace under it is only about a
foot high. I don't know much about house construction, but I don't think it
would be particulary easy to drill a new hole through the footer; since
access from both above and below is minimal.
I thought about cutting the wire before it goes up through the footer, but
there is almost no slack, so I would have to use two junction boxes (one on
each end, with new piece of cable between them.) Is that an acceptable
practice? It sure would be ugly. Or, can I just use a large junction box,
and make both connections in it? (As well as to the switch leg, obviously.)

I could probably run the switch leg under the baseboard molding; though it
would probably require cutting away drywall and/or routing a rabbet in the
baseboard. Is that acceptable?

Finally I could buy one of those remote switch units, but that seems pretty
wimpy.

Any suggestions? (I mean other than hiring an electrician.)