As far as tests that are similar to what I do in the real commercial program, I’d recommend the 3rd test called out in this post in your previous complex thread. It’s the one about 2nd order minimization of the difference between the real and imaginary parts of the first eigenvector of a rotation matrix. If needed, I can change the functions it is using so that it doesn’t do the static assert about Vector Block, and so that it doesn’t use the val function from my implementation (maybe value_of could be used in some cases).
For the real thing though, I can only promise to keep trying to compile my code with your implementation and testing it.