Before running candidates must sign a contract requiring them to resign upon successful institution of the party's policy.
Two things will ensure this actually happens:
Reprensentatives must change their legal name change to reflect the party platform.
Example:
Chastity Pelosi must change her name to '15-dollar-minimum-wage'
This shifts focus from the person to the issue.
Being able to annual rotate representatives of a kamikaze party would help drastically reduce the likelihood of representatives being corrupted. Unfortunately, in practice, this seems like a tricky thing to do.
For example, Article I, Section 2, Clause 4 of the Constitution says:
When vacancies happen in the Representation from any State, the Executive Authority thereof shall issue Writs of Election to fill such Vacancies.[source]
This seems to mean that in the House of Representatives vacancies are filled by special elections. Alternatively, if parties could decide how to fill vacancies in their own party then kamikaze parties could administer an annual resignation for their representatives, and institute a new, anonymous representative each year.