Update on my last suggestion of using flashers for the individual front lights with the relays for the rear. I just bench tested the 535 flasher I have with a single #87 6V bulb and it flashes just fine (also with two of the #87's.) It didn't work with either one or two 6V #51 (dash light) bulbs. No flash but normal brightness with one, and two were dim.
Here's a cleaned up diagram for the 2-relay diagram with additional flashers for the front bulbs.

Jerry, Chicken livers would be OK, but Night Crawlers, not so much. LOL!
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Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.