Use the C4S that uses the 2N2907. Use a POT for the current set resistor. Put the OTL cap to the wiper.
At one end you'll get a standard CCS fed cathode follower.
In the middle you'll get a hybrid push-pull amp with a reasonably low output Z.
At the far end, the solid state handles all the drive current and the cathode follower pretty much sees a high impedance.
The pot can be tweaked for tone.
