Agree:
"All of the actual laws of nature can be considered to be one large system that controls all processes in our universe. Science is a means of discovering what some of these universal laws might be. "
"My thesis in this essay is to suggest that all experimental test results that supposedly support quantum mechanics can actually be explained using conventional physics."
I (the Scalar Theory of Everything - STOE) go a step farther. The experiments/observations of astronomy/cosmology and the sub-atomic worlds can be described (explained) by equations of the Newtonian world. All that is required is a better descriptions of the parameters.
The STOE forms a Universal Equation and applies it to astronomical/cosmological problems and to light interference experiments https://www.researchgate.net/publication/328489883_STOE_replaces_relativity_and_quantum_mechanics
You focus on the Copenhagen Interpretation of Quantum Mechanics (QM). The Bohm Interpretation (BI) of QM posits the particles/light have a definite position and momentum which is directed by a wave. Bohm doesn't identify the source of the wave. BI then derives the Schrodinger Equation as a measurement probality. The STOE says the wave is real and the source is the moving particle/photon following Newton.
The Afshar Experiment (see wikipedia) rejects the Copenhagen Interpretation. https://www.scirp.org/journal/paperinformation.aspx?paperid=93056 rejects the wave nature of light and poses a problem for BI. There are other light interference experiments that reject the wave nature of light. All of the experiments do NOT reject the STOE model of light.
The STOE suggests "spin" is not actual rotation of particles but is a magnetic effect resulting from the structure of particles and their interaction with the external magnetic field.
I may have misinterpreted your description of the entanglement experiments. The experiment is to have the pair with opposite spins, then change the spin of one and detect that the other changes also. I agree, "entanglement" results from real properties - that the medium supporting the wave action has waves traveling much faster than light. It was speculated by Newton.
Hodge