It turns out this board works fine for TPI programming as well. The 6 pin end has the correct pinout. You do need to jumper the target power for 5 volts, as that’s the only voltage supported for programming. You would also need to add some extra circuit to give a 12 volt pulse on !RESET if you configure that pin as a GPIO pin.

The bad news for me is that avrdude doesn’t support the ATMelICE in TPI mode. So that means using “atprogram” under Windows. Groan.