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The Hadamard gate performs the following operation on an incoming electron spin:

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What is a realistic laboratory way of implementing a Hadamard gate that will change a known electron spin into one with an equal superposition of UP and DOWN spin?

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You almost always drive the desired electron spin transition with microwaves at a certain power for a certain period of time.

For example, if you were working on nitrogen vacancy centers in diamond, you'd first calibrate by finding the transition frequency (usually around 2.5-3GHz), then you'd drive that transition with a certain microwave power to determine the Rabi frequency of that drive. Then the inverse of the Rabi frequency tells you how long it takes to completely exchange populations from $|0\rangle \leftrightarrow |1\rangle$, so applying a pulse for half that time will result in a Hadamard gate.

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