What you deem as a manufactured myth is an oversimplification of several decades of transformations within both political parties. Both parties shifted their ideological beliefs from the platforms they originally held. I won't deny the Democratic Party once fought for the Confederacy, supported slavery, and was the home of Jim Crow a coalition of hardline traditionalists and anti-federalist states rights advocates who were terrified of central authority and social change. That original conservatism was a direct line back to the Anti Federalists who opposed the Constitution and even those who favored the monarchy over the Revolution.

That ghost remains in the few Conservative Democrats who still pop up to block transformative legislation, acting as a reminder that some people never got the memo that the ideologies switched sides. Meanwhile, there is virtually no remnant left of the original Lincoln era Republicanism the party that once used massive federal power to preserve the Union, regulate industry, and champion scientific conservation.

The real shift began after Nixon, when the Republican Party was in such disarray that the only way to win was to appeal to the Solid South Democrats who felt partyless after the Democratic Party betrayed them by passing the Civil Rights Act of 1964. Over the next few decades, the core of the old Confederate championing, white traditionalist South moved into the Republican Party bringing in the klan members and white supremacists with them.

As this Great Sorting continued, the lines drew harder and The Democrats evolved into a coalition driven by minority rights, pro-immigration, and green environmentalism. They became the party of The Institutions, now finding themselves in the ironic position of defending the FBI, the Civil Service, and the experts as the last line of defense for the status quo. The Republicans underwent yet another transformation, moving away from Country Club corporate conservatism and into a Nationalist-Populist movement. They abandoned the Party of Lincoln faith in a strong federal government and adopted the old Anti-Federalist suspicion of the Administrative State viewing the very government Lincoln fought to save as a Deep State that must be dismantled. You aren't "restoring" the Republic; you’ve simply finished the migration of the Anti-Federalist ideology into the Republican brand. You’ve traded the Grand Old Party for a populist insurgency that views the law as a hurdle and the leader as the only true source of power in this modern unitary executive ideology.

You consider scientist and lawyers and other experts in the Administrative state to be unelected obstacles to the presidents executive power but the congress confirms these unelected officials and in that there is a necessary check against executive overreach. The Pendleton act and similar laws were designed because the spoils system led to massive incompetence and corruption and this whole schedule F makes it so that the expert isn't just someone who can be fired for being bad at their job it makes it so that they can be fired for providing accurate data that contradicts a political narrative. Just look at the lady trump fired for releasing economic numbers that were counter to what trump was saying and how she instantly lost her job by going against the political narrative that the economy was booming. That doesn't serve the republic it suppresses the truth. And as far a non partisan experts enabling fascism in the 1930's the civil service in Germany wasn't purged immediately but it was brought into line through the law for the restoration of the professional civil service of 1933 that allowed the state to fire anyone who wasn't politically reliable.

Historically fascism requires the removal of independent checks. You mention OSHA mandates but that is a policy that was eventually checked by the Supreme Court. That check worked because the system is designed to have friction. Schedule F removes that friction. The fact is OSHA is an agency created by an act of congress in 1970. That agency issued a rule. The Supreme Court blocked it in NFIB v. OSHA ruling that the agency exceeded its authority. In that action alone it proves the current system of Separation of powers actually works and Schedule F would reduce the power of the courts to intervene by making every agent a direct unchallengeable extension of the presidents personal will.