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What options are there for running electrical to the middle of a lathe and plaster ceiling?

My room is about 9' by 9' with a slab floor. The joists run east-west, and the lathe runs north-south.

All options are awkward, as the ceiling is still in place.

To the south of this room is a walk in unfinished basement area that could be used for access:

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Some good info is here, but not specific to lathe ceilings: How can I install a light fixture in the ceiling of a finished room?

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There are two options that don't involve drilling hole in joists and fishing wire:

  • Carefully cut out an entire lathe. Score both sides of the plaster and ever so gently drop the entire strip. Notch each joist, run the wire, and install metal cover plates.

  • Same as the first one, except use a 2" hole saw at each joist, and remove only the 2" of plaster and wood. Notch the joist as above.

Before starting, research the topic of joist notching rules... the middle of a floor joist on the bottom is in tension, and not the best place for a notch.

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