Preferably PCC88.
It may be possible if positive grid bias is used to increase anode current and gm.
The higher battery voltage source will supply and under heat if needed heaters and also supply anodes directly through the high impedance headphone windings.
Oops, the heater is 7V which is not very high. Perhaps 2 PCC88 can be used heaters in series. This will allow under heated operation (which seems desirable) at 12V supply. 12V for anodes should be great as a doubling of voltage quadruples power, P=(V squared) / 2.
The 2 paralleled triodes for each channel will also reduce output impedance to half .
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