I do not believe SourceTree provides a way to do this in the UI. I imagine usage of "orphan" branches is so rare that if they DID support it, they would have more people using it on accident and panicking ("WHERE DID MY FILES GO?!?!?!?!1111") than they would have people using it on purpose.
Additionally, the required command is so simple, it doesn't really add a huge burden to those of you who have a legitimate use.
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