Highlighting a counter

In the The Burning Blue module there are RAF squadrons that can get orders in the form of an Order marker that is placed where the squadron is supposed to go. When there are many squadrons and orders, it can be difficult to find the Order marker for a specific squadron, or the squadron for a specific Order marker.

I wonder if there is a way to highlight both at the same time, or even better to draw a line between them. I brought this last idea up previously, but there were no takers, so I expect it is not possible. But can one highlight the two units (that are connected through an attachment)?

The Border Outline could be used, but it should also be switched off again, like with a map flare. I can’t find any trait or timer that can switch the highlighting off.

Any ideas?