Ok sourced and took Dans advice which was the easiest method to adopt
If you already have a AC/DC adapter for your Canon then buy a PowerTechPlus N287 12v to selectable V converter from Jaycar for $25
cut the supplied connector off (not the cigarette lighter plug end the other one) and splice the cable into the output power connectors on the MB of the Canon adapter, the lead is colour codes for positive/negative and marked on the plug you'll cut off so easy to follow (screws are under the label on the Canon adapter box to take it apart)
make sure you have all you + and - going to the right place and bobs you uncle, works a treat (no guarantees if you FIU though)
See pictures
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