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Jeff,
Regarding the bolts holding the whole bracket, the wrench would have to move from inside toward outside of the coach ( 90 degrees to the axis of the coach). There is no space for this since the only access is parallel to the axis of the coach. Also, to do this you'd need an electeric wrench, which has a 20" neck.

Regarding the use of a screwdriver on the latch, the latch does not releasebwith pressure on the locking arm. I opened the bay next to it, closed the latch and tried that to see if that's an alternate method. No bueno.

The rain slowed down, so I'm gonna get ready to go.........

Well they were thoughts. I am sure you have gone through all the scenarios, like Richard said, hard to visualize without seeing it for yourself. 

I was thinking the latch was like a car latch and would not respond to the prying, but it was a thought. Its good that you have another example to experiment on. 

Well hopefully you can remove those catches and free it and then you can figure out a better system to release it in the future.