I believe you could feed the output of the Z1000 to a plug that fits in place of the wall adapter for the DCS Explorer. You could then vary the voltage to the track through the DCS Explorer. I do this with the TIU, but it is slightly different situation, because the TIU has a pass through power input. I assume the wall adapter for the DCS Explorer is 18V AC. I would check this first. It will be on the label of the wall adapter. Post a picture if you can't tell.
George