How to make the Apple Watch display functional sweep second hand?

I know this has been asked before, but with recent updates, the algorithm to fix it in settings no longer exists:

Anyone know how to make the apple watch display functional sweep second hand for long enough to take vital signs as a healthcare provider? I need this thing to stay on for minutes, not seconds, and it needs to be hands free, because my other hand is already busy.

[Re-Titled by Moderator]