Rootman

I concur, take the lane, watch for oncoming traffic and keep an eye on the mirror. If someone is behind you and you can see that there is more than enough space for them to pass then wave them around and pull over to the right tire track, else hold the lane to discourage them from passing unsafely. No matter what you do it is risky and you are putting yourself in peril, but if there is no other way around this bridge then cross it the safest way you can.

And I appreciate you wearing the hi-viz stuff too, we are practically invisible to motorists anyway and anything we can wear to catch their eye is highly advisable. I see too many bikers in dark clothing that just blends into the background or horizon.