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Though I doubt that Jefferson gave the matter much thought.

Actually, I think the opposite is more true. Jefferson's racial attitudes permeated throughout his career. When we say that racial attitudes must be taken within the context of the times, we can give them a "pass". I believe that Jefferson would be considered a racist in any time. Were you aware that he was called the "Negro President", and that, unlike Bill Clinton, it wasn't because he pandered to the black vote? When Jefferson included the words "all men are created equal" what he meant was that blacks weren't men?

Here we see references to "Deportation Plans" advocated by Jefferson, but curiously I have yet to find where he did much more than talk or rabble-rouse.

Here is another reference to Jefferson's attitudes towards the deliberate (forced) deportation of the Negros (paragraphs and bolding mine):

THE BILL on the subject of slaves was a mere digest of the existing laws respecting them, without an intimation of a plan for a future and a general emancipation. It was thought better that this should be kept back, and attempted only by way of amendment, whenever the bill should be brought in. The principles of the amendment were, however, agreed on, that is to say, the freedom of all born after a certain day, and deportation at a proper age. But it was found that the public mind would not yet bear the proposition, not will it bear it even at this day.
Yet the day is not distant when it must bear it and adopt it or worse will follow. Nothing is more certainly written in the book of fate than that these people are to be free; nor is it less certain that the two races, equally free, cannot live in the same government. Nature, habit, opinion have drawn indelible lines of distinction between them. It is still in our power to direct the process of emancipation and deportation, peaceably, and in such slow degree as that the evil will wear off insensibly, and their place will, pari passu, filled up by free white labors.
If, on the contrary, it is left to force itself on, human nature must shudder at the prospect held up. We should in vain look for example in the Spanish deportation or depletion of the Moors. This precedent would fall short in our case (Autobiography, 1821)

There is much, much more, but I'll stop here (for now ;-)