Absolutely none of your points are codified by law, and we are still a country of laws. The only case you might be able to make with your arguments is that Ryan should be president, which is no better than Pence or Trump.
Our only hope is to work hard to help the Dems take back both houses in 2018. Then it won’t matter nearly as much who remains president, and we can fix it better in 2020.
Meanwhile, be careful what you wish for, or you may indeed end up with President Pence. I’d rather have a bumbling imbecile trying to foster the GOP’s evil austerity plan than a seasoned pol who also happens to be a member of a doomsday cult!