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I think you'll see the biggest jump in image quality if you can modify the set to accept "S video". That's separate luma and chroma, not mixed together. This would be non-trivial to do, though, you need to find the chroma luma separator (usually some sort of LC trap or bandpass circuit). Then you have to inject (with the right amplitude and polarity) the luma into the circuit that received the luma from the separator, and chroma the chroma.
As for hot chassis sets, an isolation transformer would be best, but be careful where you install it, to keep stray magnetic fields out of the CRT.
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