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The way you split the interest income will not affect either party's ability to e-file their return. 

The partner to whom Form 1099-INT is issued could also just choose to declare all of the income and then gift part of it to the other partner. 

Download a PDF of the Form 1099-INT here. Review the instructions as to how to complete and file the form if applicable.

Or, the partner not on the 1099-INT could report half as income and the other could report all of the 1099 and then select the option to adjust the interest as a nominee, and enter a negative number for the amount that person is not reporting. See screenshots below.

See this TurboTax tips article for more information.