It wouldn't be hard to wire them the other way. Three relays required. Bottom contact on the switch to the trigger on one relay with the output for it going to the ambers. Run two wires off of the top contact on the switch to the triggers of the other two relays, output of one to the ambers, output of the other to the bar.
The relays typically come 5 prong, you'd only be using 4 on each of them. One is a ground, one is the trigger, one is the input from the battery, and the last is the output to the lights. The 5th prong, the center one, would go unused on them in this case. On your switch, low power would go into the center pin. The outside two are your outputs to the relays.
The relays typically come 5 prong, you'd only be using 4 on each of them. One is a ground, one is the trigger, one is the input from the battery, and the last is the output to the lights. The 5th prong, the center one, would go unused on them in this case. On your switch, low power would go into the center pin. The outside two are your outputs to the relays.