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If you are using Blocks (not InterfaceBlocks) to Type your Ports just use "manual" feature-by feature direction inversion to achieve type conjugation (and you can even use a ~ tilde prefix)

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UML keywords
SysMLv1.x keywords
In fact, some SysML users already used the ~ tilde prefix for conjugated types long before the SysML-1.6 ~InterfaceBlock was introduced.
Just don't stereotype your "manual" conjugate as an «~interfaceBlock»!
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