Upgrading XF 1.5 to 2.2.8, also moving to a new host with PHP>7.2

[Treat]

Got a double for you. I'm upgrading a XF1.5 to the latest 2.2.8. I'm also moving hosts. Their PHP is higher than XF 1.5 can handle so I'm getting Uncaught ErrorException: array_key_exists() errors.

Is there a workaround here? Pretty sure I cannot downgrade my php install at my host site.

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