And we are on the cusp of the Seventh party system: The Republicans Party becomes a cult of personality centered on the mythos of Donald Trump. Its platform is one of support for the right of states to determine their own social policies, economic protectionism, re-industrialization, nativism and a de-escalation of global conflicts.
The new coalition is more multiracial/multiethnic than before. Especially if Trump's policies begin to make the conditions of everyday life improve in an obvious way. But, the party will still be predominantly white. It will also much more open to new elements like your RFK's and Gabbards as well as labor unions, many of which I predict will begin to realign with the GOP over immigration. Labor's loyalty to the Democrats is a historical anachronism, organized labor is naturally anti-immigration and the time has finally come for this aberration to correct itself.
Natural tensions within this new coalition will for a time be suppressed by personal charisma of Donald Trump. Time will tell if it can cohere into a stable entity once he dies or retires from public life.