The original post asks (paraphrased): how can I reject hypotheses in a Bayesian clinical trial … and present an interval … and test multiple hypotheses … and present the results to agencies?
Here are two considerations. First, what is best practice. Second, reporting whatever analysis you landed on. Re best practice, Andrew and Frank gave pointers in their replies. Re reporting, see this recent post in the forum:
In particular, note that if you use a Bayesian hypothesis test, the BARG recommend not to report only the Bayes factor, but to report also the decision criterion for the posterior model probability and the minimum prior model probability for which the criterion is exceeded.