high current mux
You could use a high pin count microcontroller and connect each of the zif pins to a microcontroller pin. Then, in software, you could set the power pin to vcc, the ground pin to ground and leave the rest tri-stated so they do not interfere. PICs can supply 25mA in their pins, you could probably stretch that to 30 mA without damage. Perhaps other microcontrollers have higher supply capacities.
I suppose you are already using a microcontroller so that you should be able to use a 40 pin uC and cover every available socket pin and have the uC do all of the testing.
If you aren't using a microcontroller, then you should still use one merely to distribute power since I don't know of any non-uC IC that could do the job. Or, go FPGA...