Can the micro-single be externally connected with a flash?

Not all microbatteries/batteries can be externally connected to the flash. Generally, only those with hot boots can connect the flash.

Hot boot brands include Canon M series, Fuji full series and Ou Lin Bath full series.

Sony's high-end micro-single has hot boots, but the low-end does not.

Nikon 1 high-end V series only has hot boots.

However, for vehicles without hot shoes, the dome light can be used to trigger the external lighting control light.