USB connection delay

During my development and testing cycle, I'm frequently re-connecting my watch as a USB drive to my Mac, and am frustrated having to wait for the sometimes 30+ seconds before the Mac automatically recognises the new connection.

And no, the Sim is not the solution as my I'm testing some real-world conditions.

It happens with both my F5 and VA-HR, so not the particular watch.

A USB memory stick gets recognised almost instantly.

Is there any way to force the Mac to re-establish the connection?