I spent a few hours hunting around for a socket that would accept a row of pins on 2.0 mm centers. There are quite a few of them, but most are designed to accept small square pins, perhaps as wide as 0.66 mm. The pins on the Vacuum Fluorescent Display are 0.7 ±0.12 mm wide and only 0.18 mm thick. This would be trivial if I wanted to solder it directly to a PCB, but I'm not in a position to know what I need in the way of a final PCB yet, and I don't want to risk damaging the VFD by trying to removing it from a PCB.
A second option is to simply solder some wires to the pins and plug them into the solderless breadboard for testing. The only bit that seems critical is the pin is connected to an on-display oscillator, which requires an RC circuit that needs to be connected close to the pin. For this I'd simply solder the resistor and capacitor directly to the oscillator pin.