My master bedroom has a single light switch for the overhead fixture; however, it was built in the 50's and has end-line "power at the light" wiring like so:
Image borrowed from this question, but I don't have the option of #2 as suggested there, since this is a bedroom light and not a utility light. Another reason I'm asking, is I'd like to keep my work code-compliant.
EDIT: Yes, I plan on replacing the switch with a smart switch (ZWave, which I can't seem to find in a non-decora style that doesn't require a neutral, and this particular switch has a switch plate that is a decorative one inherited from family so it has strong sentimental value and thus replacing with a decora style switch isn't an option for us).
Is it code-compliant to just re-fish 14/3 down into the wall in place of the old wire, and use the traveler to bring neutral into the box (and make damn sure the white wire is black-tagged, because I'm pretty sure the existing wire isn't), or should I rewire the whole thing as power-through, bringing 14/2 wire from the breaker down into the switch with the neutral, and having another run of 14/2 taking both hot and neutral back up to the fixture? Or is there another (code-compliant!) option I'm not seeing?
As tagged, this is USA, so NEC/NFPA70 applies.