Sorry to bump and old thread but I have a solution...
You can get the job done with a T-Rex Chameleon.
Use a
current doubling (parallel) Y cable with 2 of the 12v outputs which would give you 600mA at 12v DC. Do NOT use a Y cable that puts the power in series as it would combine to make 24v and probably destroy your (expensive) pedal.
Problem solved
