My understanding (and I could be wrong) is that it's currently treated correctly on your return.  Dividends and interest should not be subject to SE tax, which is what you'd have to do to get them on the 568.  Generally int & div earned in a single-owner unincorporated business are reported on SchB.

If you are concerned about matching gross income 1099's, you can add in the 1099-DIV income in SchC gross receipts and then back it out as an other expense item with the description "int & div reported on 1040 SchB" to spare your client a CP2000 notice.