I'm going to refer you back to the answer that you received above from @AliciaP1. You don't need to do any of this. As an RDP you are not married for federal purposes. You will simply file completely separate returns as if you were single (or head of household if you have any dependents). You don't have to allocate your income for your federal return at all.
Your joint return in California is the only return where things need to be put together.
Here's the IRS FAQ on RDPs.
@Anonymous
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