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hello there, I have a 12 years old domain with 35pa and similar domain authority pointed to my hosting which I will call domain A. in December  2020 I will lose the control domain A, as the person controlling the domain died and trying to find a solution but is not possible as it's far more complicated than I anticipated, the domain might be retained by someone else and not me. so I purchased a new domain I will call Domain B. my plan is to serve the info hosted from both domains but B as a principal,  I think I can do a 301 in domain A but i wish still be visible in the URL until last minute. but i want to start to  pass as soon as possible all the link juice. my problems is how can i serve the content from both domains without creating a 301 but and still be able passing juice link from A to B? is this possible? and from google getting all the indexation for Domain B. bot not for A