Worn Part aqnd a Conundrum

Here is what I wrote about yesterday. The rear drive, near the where the wheel is mounted, looks to be ground pretty badly.
And here is my conundrum for the day. The bottom plate is the starter cover. I would like to get the starter out of there to test and lighten the weight of the engine. If I am going to lift that big boy out myself or with minimal help, it had better be as light as I can make it.
Here, you see a bolt coming up from the starter cover. It cannot be removed because it abuts the coolant pipe attachment. Why not remove the coolant pipe attachment? If you look to the right of the bolt circled in red, there is a bolt that holds the attachment onto the cylinder. It cannot be removed without removing the starter cover!

The only solution that comes to mind here is to remove the other two attachment bolts, loosen the third (the one shown) and rotate it enough on the third so that the cover bolt will come out. Then I can get the cover off and then completely remove the third bolt.

But another little problem. That little bolt on the pipe attachment is exceedingly tight. Neither socket nor closed end wrench will fit. An open end wrench would not hold and wore two edges off the bolt.

I am certainly not done with this one yet...