Thinking about it a little further I dont think it would be as simple as adding a resistor into the line. You would need a resistor that would only resist when the brakes were on, otherwise when your blinker was on and your brakes were not then the resistor would still be resisting and the relay would most like read out too much resistance and blink fast anyway. So long story short, I think your aftermarket relay for $20 would be the best bet by far.
The tail section wiring - between the bike's wiring harness and the wires going to the turn signals and the tail light. If you pop off your seat and look back into the tail at the tail light bulbs, that's most of the wiring you'll deal with.
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