Principle Propagation SAML: Single Stack using SOAP adapter

Hi Folks,

Scenario 3rd party non SAP -> SAP PI -> SAP ECC

Que: Does the single stack now support Principle Propagation using SAML?

The posts I have read so far conclude that SAML is only supported on the dual stack, not the single stack when using a sender SOAP Adapter in SAP PI.

SAP Help gives steps for dual stack: Configuring Principal Propagation (SAML) - SAP Help Portal

This post from 2013 concludes no support for SAML in the single stack: PI 7.31 AEX - Principal Propagation

My time would better spent looking for an alternative solution for Principal Propagation rather than chasing something which is not supported (SAML on single stack, third party consumer non SAP, sender SOAP adapter).

Any help appreciated.

Che