Flood the November 6th meeting for Rubio. Every time Trump tries to speak, he should be booed so loudly that he can't even be heard. DeSantis signs should be seen everywhere. Trump should be literally booed off the stage.
This template should be set for all future Trump appearances. Politicians will avoid his sponsorship and he will become a " persona non grata."
There will be a Trump-DeSantis Armageddon eventually, so it's better to get it over with, sooner rather than later.