That Morley PS should work fine
If it doesn't, the worse that will happen is that the power supply will cut out, then if you unplug it and pulg it in again, it will go back to working as it did before. (but it will do the same thing again if you plug it into the daisy chain again)
anything that is 9v, centre-negative and regulated will be fine. The only thing that might happen is that you might exceed the pedal's current rating (for example using a 300mA PS with a multifx that draws 500mA) then all that will happen is what I explained above.