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Using tubular caps in those HV coupling circuits seems to be the popular wisdom. I have never tried ceramic discs there to find out, but my understanding is that they may distort the scanning signals. What form that would take, I'm not sure. Perhaps anything from poor linearity to a scrambled picture.
As a rule, I don't use ceramic discs in any place where they were not originally used, especially in sweep circuits where high frequencies may beat them up.
I have a couple of other 7-inch sets waiting for restoration. If I ever get around to them, maybe I'll try substituting a couple of ceramic discs once the TV is working, just out of curiosity.
Phil Nelson
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