Did you get it working yet?
If so, you can disregard the following.
It occurred to me that these relays are cheaper and easier to get than power resistors so if you already have a no-load flasher then you could build your own "converter" with only relays.
The top diagram is simpler, more rugged, and will give you brighter lights, but does require a constant 12 volt supply.
The bottom diagram uses diodes to feed 12 volts from whichever lead is powered. You will lose about a volt through the diode [plus the drop from the factory wiring] so the lights won't be as bright. Unless you rob the diodes from a junk alternator, this setup isn't going to be any cheaper or easier than running a wire to a 12 volt supply.
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