Sail Race Timer Reset

How to I reset the race timer WITHOUT exiting the activity?

I do dinghy racing and have only a few minutes between races in a tiny, wet, rocking boat. For the next race I want to re-start the 5m countdown timer and preserve the active waypoint (the single mark we race around). The only way I have figured out so far how to re-start the countdown timer is to exit the activity (multiple button presses including scrolling to choose whether to save/discard/resume), start the activity again (multiple button presses to choose it and get back to timer screen). Even worse, that exits the active navigation so I have to do even more frantic work to get back to navigating to the same waypoint. Is there another way? I can start a new "lap" (whatever that means) but that doesn't give me a count-down timer.