It's a similar concept, yes, but at its core a completely different hack - it's based on one plugin and a custom profile field, with only one question and one answer, and not a matter of controlling things through the admin CP at all.
I already think this should more or less work for 3.5 with a couple of minor edits to the product XML to remove the 3.6-only stuff, given that it's fairly simple and not really interacting much with any default vBulletin functions...
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