Keeping Existing Switches? (micro relays)

Not quite.

The micro relay is powered by the neutral wire on the circuit, so it’s always on no matter what position The switch is in.

Perhaps you were confused by discussion of smart bulbs. If you’re going to use smart bulbs, they get their power from the regular load line, so you have to keep the switch always on so that the bulbs have power even when the bulb looks off.

But that’s not how micro relays work. They are wired into the circuit in such a way that they get power even when the switch is off.