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What i am thinking of doing is posting all my new material on the new domain in such a way that the interface is invisible to the user. If they click on the link for "article one" they stay at the current domain, but if they click on "article two" they move to the new domain. Over the coming 6 - 8 months, i plan to slowly shift my existing articles to the new domain in the same way, always being sure not to have duplicate material on both sites.
It's my theory that by cross-linking the two domains this way, but never having the same material on them, Google will pick up the new site and the new pages and i will not drop too far in my SERP placements.
Keeping in mind that i do not have the option to do redirects, does this seem like a safe and effective way to change domains without incurring penalties?