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No problem Alex, always happy to help! For client.com to benefit from the content migration, it will need to be linked to in some way, preferably from the nav. Perhaps this could be done using a less obvious link in the header similar to where you'd expect to find a Login link but without a link to the content search engines have no way of finding it. This link can be external but strong internal linking practices are important too. Moz does a great job of covering this here. In terms of improving overall site strength, it will help. As you said, the engagement metrics will send some positive signals that people actually like the site but more significantly, it's going to be a lot more niche-specific, high-quality content going on the site that helps paint the picture of exactly what you do.

Thanks David. That's too bad that alternate TLD's aren't supported yet, but I'm definitely relieved to hear that that's what the issue was. Thanks for the quick response! Cheers, Alex