How to fill a breadcrumb variable into page title in threads

[CTS]

(I have another thread here but please ignore it. Poorly crafted thread and a mess of ideas. Focused here now)

Goal: To extract and use second level breadcrumb text to append to the beginning of the page meta title contents ( <title>contents</title> ) of a thread view, located in the PAGE_CONTAINER template. This when thread is displayed and a second level breadcrumb exists.

PAGE_CONTAINER template:
From:
Code:

<title><xf:title formatter="%s | %s" fallback="{$xf.options.boardTitle}"...

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How to fill a breadcrumb variable into page title in threads

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