Yes. But ONLY if you can submit/substitute a valid I-864 from a qualified petitioner/sponsor who has documented sufficient earned income for the future or sufficient assets. Past tax returns do not qualify a sponsor. Expected earned income (based on current gross income) for the future 12 months or sufficient assets are the qualifiers. "We expect the petitioner to have qualified employment" will not work.
I would take the new I-864 to the interview.
Remember that, once the visa has been issued, the Joint Sponsor is obligated under the I-864 until new immigrant has become a US citizen, has lost LPR status, has earned 40 credited quarters of work, or has died.