headlight flashers

Ok, here's the plan

I have a 99 chevy silverado.  It has fourteen light housings (headlights, daytime lights, taillights, etc..)   I plan to install 7 pairs of varad headlight flashers, one light in each housing.  OK, I'm going to use the latched aux output of alarm to run a relay to turn them all on.  The problem is I'm pretty sure they are all gonna flash at the same time.  Does anybody know a way to make them flash separately?

Here's what I was thinking:

Each pair of lights has it's own flashing module.  I was planning on running the 12v output of relay to all modules.  Is there something that can be wired inline from relay to module that will delay the module turning on?  If each module turned on at  different time then the lights would flash differently, right?

I don't mind if the lights flash at the same speed just not at the same time.  I hope this wasn't too confusing.  Any suggestions please?

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