Not an unreasonable plan, but I would want to be certain that gains recognized in 2024 before establishing your overseas tax home would only be taxed in the US. It could be that Portugal taxes you for the whole year. If this were a US state, most would treat your first year as a part-year resident and allow you to not include the income before you established residency, but who knows about Portugal. I would suggest finding a tax profession in Portugal to hire and ask this question of.
Also I want to read and understand the US tax treaty with Portugal.
https://www.irs.gov/businesses/international-businesses/portugal-tax-treaty-documents
It might have the answer or at least inform you for the future.
And for the future (when you have an overseas tax home) you need to understand the details of the Foreign Tax Credit (FTC). It is quite complicated, but it will usually (but not always) reduce your US 1040 taxes to zero because you will (usually) get a credit for the overseas taxes paid. Our taxes are so low that US taxes usually wind up being zeroed out. There are ways this doesn't work out, so your particulars matter a lot (particularly if you have US income that is not subject to overseas taxation).
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