Acoustic control and coupling of quantum systems via phonons can enable miniaturized on-chip quantum devices. Optically active quantum dots (QDs) are essential for such platforms, yet they have long lacked direct acoustic transitions between charge states. The recently proposed hybrid acousto-optical swing-up scheme introduces such high-fidelity transitions but, as typical for coherent control, requires driving fields matching the transition energy and has been proposed for sub-THz phonon frequencies, limiting practical implementations. Here, we overcome this limitation by exploiting higher-harmonic-assisted processes arising from strain-induced modulation of the optical transition energy. This parametric modulation of the optically dressed splitting produces multi-phonon-like resonances when a harmonic of the mechanical modulation matches the generalized Rabi frequency. An effective model reveals a hierarchy of harmonic couplings, while our geometric interpretation shows how modulated dressed splitting enables even harmonics that are otherwise symmetry-forbidden. We predict faithful state preparation with an acoustic frequency being only a fraction of the splitting, specifically 42 GHz for a 0.341 THz splitting, bridging accessible acoustic frequencies and THz energy scales. This establishes control principles that separate optical energy delivery from coherent acoustic control. A non-Markovian calculation of phonon-induced decoherence indicates high state-preparation fidelities comparable to one-phonon and all-optical schemes. Since the same interaction structure arises for a quantized acoustic field, our results provide a foundation for multi-phonon processes in QD-phononic-resonator systems, including entanglement, state transfer, and optical preparation of nonclassical mechanical states.