Still leaves all the mercenary aids and middle management to corrupt and derail any new blood.
Nope. Corrupt to the core. Why waste resource and time fixing an albatross? Answer? You don’t.
Over time such a system will evolve/devolve to having two large coalition groups ~ you can call them parties if you want. That's because to win you need 50% + 1 vote ~ else you lose.
Starting up a new party requires you to enter a situation where there are two large coalition parties that divide up about 100% of the voters!
As the Republicans proved in the 1850s it's a lot easier to create a National Committee and invite in residual elements (organized at the state level) of the Whigs and the Abolitionists.
As you know the Abolitionists are the only large mass movement in American history that succeeded in almost becoming a political party on its own ~ with nationwide resources and capabilities.
They didn't do it but a small group in Wisconsin, and another in Michigan succeeded in welding together the Whig factions and the Abolitionists!