Relays should work for your situation but am wondering about the cost. From what I can see with a quick check, average for 6v relay is around $20-25 each. Rusty's suggestion in any case, would be a good start.
Am wondering about the possibility of this item
http://automotive-hardware.com/universal-turn-signal-switch-black-p-307.html working. The schematic looks to be very similar to what the relays will accomplish but of course, the devil is in the details inside the switch.
There is another company that advertises a more or less custom fix
http://www.turnsignalsforclassics.com/ which also sounds as if it might fit your situation. Another seems to be similar to the first
http://www.dealparts.com/product/16-2101-0.html but may not have the stoplight function.
Anyway, just a few more options to confuse you further.
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