KeyBoard Lights

Can I send my mac air in and get the keys that are backlited installed ?

No.
It's not just a matter of putting in a keyboard that has backlighting. The logicboard has to have the requisite connectors and controls, which yours does not have. Even if you replaced the logicboard too (which I doubt can be done), there are physical differences in the new keyboard that would prevent the task as well. It would be far less expensive to sell yours, and buy one with backlighting.

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