The Republican Party was NOT made into a fascist party by Trump. The Republican Party was already well down the road of Christo-Fascism, Trump just speeded up the process.
Trump’s attempt to subvert democracy was something he had said over and over again he was going to do, and indeed is a necessary feature of his entire conspiratorial white supremacist frame.
The whole idea of Trumpism without Trump is oxymoronic, because Trump is more symptom than cause. “Trumpism” is just shorthand for “chosen people” democracy American style, meaning white supremacy coupled with nationalist theocratic Christianity. The plutocrats who have traditionally controlled the Republican party were deluding themselves when they thought they could exploit the central motivating forces for contemporary conservatism without having those forces eventually take control of the party.
As Barry Goldwater told the Repubicans (or tried to tell the Republicans):