So using this addon you can do a very basic integration of pretty much anything into XenForo - be it a blog, gallery, store, standalone script, etc. Probably even vBulletin if you wanted
This example shows the header (top block of code) and footer (bottom line) you need to add to your existing script:
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$kotomi_container can be set to false for a raw integration (still passes through XenForo's framework etc, just without any XenForo HTML/CSS/templates being applied).
The example gives the following output:
(Notice how the URL is a real PHP script without routes being involved at all; it could be in a completely different directory if you wanted.)
Navigation/breadcrumbs unfortunately need to be added and configured manually.
Also removing the title text from within the page itself is as simple as editing the dark_kotomi template to your liking.