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I did pretty much the same thing you are looking to do for one of my sites a few years back - converted an archived forum from vBulletin to XF for easier maintenance.

I wrote a tutorial about how I did it and also created a small addon for XF2 which helped with the process.

I'm not sure if you can read this yet - but here is my tutorial: https://xenforo.com/community/resources/how-to-archive-a-xenforo-forum-to-make-it-read-only.7825/