Door Removal (1961 Valiant V200)

Although, I’m not sure in your situation, you should just be able to take the three bolts on either side of the hinge. If that thing that you’re looking at is inside of the door, I wouldn’t think any kind of attachments would be there too hard to get to.
I will make this suggestion that I have heard of. Drill two holes into each side of the hinge then you can use locating pins to put the hinge exactly back where it was.