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Would it be unsafe to jump the filament line where a 25 volt tube should be?
Don't do it. If you have to, take another 25 volt tube and jump those heaters in or use a suitable resistor. Jumping a 25 volt tube without suitable resistance will cook the rest of the heater string. On my RCA metal portable, I substituted a 6 volt tube for the CRT for the soft start. It didn't light up, but the rest of the string lit up normally and I was able to finish the soft start. Also, I disconnected the top cap for the hor out, but left the tube in. No problems.
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