Accessibility has always been an issue for us. This season, we're going to have a new setup. Imagine the meshing section of a hinge, but all square. Put several of these along the bumper, so bolts can drop in from the top. If this isn't that clear, I'll throw a CAD up in a few minutes...

Edit: Image 1 shows the two separate.The bottom section of the plate is threaded. When put together (image 2) the bolt can be dropped into the hole, and threaded in. This should allow us to change out from red to blue bumpers quite easily based on which alliance we're on.

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