No small task, f’sure.
Since government bow wows have “bumping” rights, the solution might simply be to close two or three federal agencies entirely.
After the dust settles and the surviving bow wows have taken their new desks, disconnect their telephones.
A lot of feds telecommute these days and often “work” at home. You can’t really disconnect their phones. Nor do many agencies want the public to be able to talk with employees; they want the public to use the web instead for all their information needs. lol
It might be easier for a camel to go through the eye of a needle than to reform Fedzilla.