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Well, your de-Dion tubes look like nothing I've ever seen, SA special?

About the camber increasing once welding is done, ,if you cut off atlmost at the end of the dedion (close to the hub), can you weld like temporary steel rods (just tack weld them to) between the hub and the dedion to to make sure that the camber stays the way it is while you weld the part where you cutoff?

Or should you just have it done at -1 degree camber and expect another -0.5 to -1 camber once welding is done? Sounds like a hit or miss.

Marvelous, I Like the flange idea!
If you did it with just 3 bolts and between the flanges a conical seat/spherical washer combo.
You just could adjust with adding 2 simple spacers/washers.
+ When the bolts are placed on the right spot in the circumference it is an simple straight forward adjustment without cross talk.