Long story short: I need to change my domain and keep the rankings on Google. 301 redirect + something done in GWT is the best option, I'm aware of that. However, there might be some direct traffic coming on my old domain in the near future and I don't want them to get redirected to my new domain because it's urgent that some of those people don't see my new domain. Is this even possible? It's also important that no one can see where the redirect is coming from (Moz, Majestic, Ahrefs, etc). I suppose blocking all crawlers other than Google bot via .htaccess solves this out. I won't go into details on this one, but this is the way it has to be.