Nope.
KCC uses kindlegen internally, and kindlegen creates dual-MOBI with both MOBI and AZW3 sections, as well as the source input.
KCC uses the option "-dont_append_source" but there is no way to avoid generating a dual-MOBI.
You can use
KindleUnpack to separate the AZW3 and MOBI (and just keep the MOBI).