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OK, here's what I did.
1) Jumper R109 so it is out of the circuit. I don't think it is needed because the contrast pot doesn't go all the way down to zero. It only goes to 93 ohms.
2) Placed a 56K resistor between pins 2 and 8 (B+) of V6 12BY7A.
3) Placed a 3.3K resistor across the 5K contrast pot to effectively make it a 2K pot per the schematic. This gives me a fair amount of rotation or range with the contrast knob.
These mods are fairly easy and give decent results. Would doing any of this cause harm to the TV?
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