No. You won't be able to claim the contributions as a tax basis unless there is a treaty provision that permits it. I checked the US/Switzerland tax treaty and there is no treaty provision that permits this. The IRS states, "there are relatively few U.S. treaties which provide benefits for cross border pension contributions (typically found under the Pension Schemes articles). Benefits may allow a U.S. citizen that is a resident in a foreign country to obtain favorable tax treatment in the foreign country for contributions made to a U.S. pension plan or may allow a U.S. citizen that is a resident in a foreign country to obtain favorable tax treatment in the U.S. for a contribution made to a foreign pension plan". In this case, there are no benefits between US/Switzerland for cross-border pension contributions.
Declare the full amount of the withdrawal and then claim a foreign tax credit against the gross lump sum distribution you received.
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