Waiver of lawsuit against licensed therapist in NY?

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Can a waiver be written by an attorney preventing a lawsuit, or loss of
license to practice, for a licensed therapist in NY that would prevent
prosecution of the therapist if the patient committed suicide?

I know that there is an exemption from confidentiality in all 50 states
regarding "harm to self or others" but is there a way that this can be
overriden by a signed waiver by the patient, thus protecting the career of
the therapist and continue to enable treatment of the patient.

The patient has suicidal ideations but cannot express them if threatened
with hospitalization (PTSD is one of the diagnoses) and if they cannot
express them it creates a double bind as true feelings cannot be spoken
about in a therapeutic environment.  There are also severe trust issues
involved.

Hospitalization is not in the best interest o the patient, even for a short
time, as it would exacerbate the condition of the patient (the patient has
been hospitalized before and seriously attempted suicide upon release
without informing anyone of intent and the release written by psychiatrists
specifically stated that the patient was of no harm to self or others).

Thanks