Black and white negative film can help you out of this dilemma if you take a moment to consider...

Your camera chooses 1/90 second for sync speed. So assume for a moment that your EI is about that, say 80.

If you set your EI at 80 and just take the shot at f/16.

Choose the fill ratio with the assumption that the film speed is 80.

Everything will be equally overexposed.

You can make up for that when you print.