I dont see how thats any better than a simple X crossing with signals in and out.

no need for the path signals on the exit.

A tunnel is a little bit more expensive but removes the speed limit. As long as the locomotives don't suffer form the speed limit or the climb it should not be a problem.

would a tunnel work better?

How do you add choice to this situation?

Entering the bridge without a choice is not the best solution

If you build this sytem try to make empty trains climb the hill.