Time code for GoPro 4 Black / Solo?

[Wamba]

I record marching band rehearsals. Some times I use my Solo to get a high vantage point that closely matches elevation and angle of some of the press boxes at their performance venues. Each time I have to manually synch the footage with a digital audio recording I make inside the stadium at the same time.

I know someone will ask - the Solo hovers outside the stadium.

Has anyone used something like the Tentacle Sync box with a GoPro 4 Black?

I am concerned that the camera's USB port is covered by a flap of the HDMI connector in the Solo.

Thank you.