Bridge deformation physic

Thank you, that Procedural Bridge Blueprint looks great, but I need something a bit different. I was trying to figure out how to apply that physics to bridge, that is created from single mesh, no many planks. But whiteout success…
I get an idea to deform mesh along spline. Simply make 2 points spline and attach mesh to it.
BP: http://i.imgur.com/M70yOdN.png

So normally it looks like this: http://i.imgur.com/g5ZvlqW.jpg
And if player steps on middle, both points tangents will rotate a bit: http://i.imgur.com/1PgTgf4.jpg
But now, I do not know how to (or if it is even possible) make point of the spline rotate on every tick event (based on players position) and deform mesh with collision in game…

This is not, probably, the best solution, but I dont know what would be better… I dont know, but I think using animation is not possible (or at least Ive no idea how to do it correctly), because player can randomly move in different directions, jump… And I was trying to find a way how to physically deform single mesh, but without success.

Thanks a lot for any advice.