Most Quantum Mechanics are formulated from a point of view of Causal Decission Theory
No, Quantum Mechanics is a chimera of the unitary evolution and the measurement postulate (sometimes disguised or motivated), it has nothing to do with decision theories.
as can be seen from the Noncontextuality/counterfactual indefiniteness of Kochen-Specker Theorem
How can we create a Quantum Theory of Self-Measurement that is compatible with Updateless or Functional Decission Theory
This will have to wait until someone really smart figures out how to resolve foundational issue of unitary evolution vs non-linear and non-unitary measurement.
No, Quantum Mechanics is a chimera of the unitary evolution and the measurement postulate (sometimes disguised or motivated), it has nothing to do with decision theories.
The KS theorem states that there are no local hidden variables independent of the observer, nothing more. For a model that postulates such a dependence, see for example superdeterminism, https://en.wikipedia.org/wiki/Superdeterminism and https://arxiv.org/abs/1912.06462.
This will have to wait until someone really smart figures out how to resolve foundational issue of unitary evolution vs non-linear and non-unitary measurement.