Ubiquitin, if there is evidence of their Jewishness but not proof positive they are safek Jewish safek goyim. Therefor, they must undergo giur without a beracha (this was done with the Ethipians). On the other hamd, they could not violate the Halacha. As for Shabbat, being that for gentiles the night follows the day they could do melachot on erev Shabbat and motza’ei Shabbat. Another possibility (for men) is wearing tziztiot in a reshut harabbim. If they are not obligated it is carrying, if they are it is not.
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