Hello Jake,
I've posted a reply to your own post, but one thing I forgot to mention, a suggestion that came out of this post (on the Tech forum ) by (sbourg) Steve, was the use of "crows-feet" although a very good idea, they will not work in this situation due to the recessed arrangement of the bolts/nuts.But utilising the same idea I am attempting to make a similar tool using a socket rather than the open-ender of the crows-feet.

Please get in touch direct if I can help
further David