I think the issue here is what is defined as corruption.

I instead would favor, on a federal level, an agency created solely to find inefficiencies in our government on a micro scale (not macro).

Make their department be funded by a minimum of a few hundred million a year, give them a huge swath of authority to levy fines on an individual person basis rather than agency/department basis, and let them keep 10% of all fines given, one third of which gets contributed to their employers pension funds, one third to the agency itself, and one third given to all tax payers via a seperate line item on their tax return, so the agency is very visible to everyone.

And when they find actual corruption, give them a mini DOJ so they can throw actual criminal charges at individuals themselves, rather than wait for the DOJ.

And lastly, the agency would only receive oversight from a very constrained group of people, be it the president himself, or the Supreme Court justices, or similar, meaning don't let congress touch it.