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18 volt power supply question

That should work, but it will cost more than an 18v power supply. And it should reduce the available current from the 9v supply.
The ISO Pump isn't a whole lot more money and it's much more convenient. You do need to keep track of the total draw on any PSU but the Ringworm only draws 70mA so it's not like it's going to be a huge sore thumb kinda burden on the system.