Declare the whole of the Administrative Regulatory State unconstitutional, shut the agencies down and send them home packing. Too bad, so sad.
In almost a blink of an eye, our economy would become so robust that those hundreds of thousands of displaced government folks would have jobs very soon. So would the rest of America.
I kind of like the general plan. The devil is in the details.
You would need a long and specific list of agencies and offices to close down. And they don't get sent home packing. They just get sent home. A security escort to the door, empty-handed, and no further admittances. Personal effects, if any, to be returned later. Or never. As you said, "Too bad, so sad".
There needs to be forensic teams assigned to clear each physical site, secure computers, critical records, funds, department armories, and other items of value.
And security teams assigned to stop "mostly peaceful protestors" from returning to a site. Or any rally location.
Shutdown operations teams take over, payout and terminate contracts and leases, inventory and dispose of salable property.
Legal teams handle the inevitable lawsuits and the decrees from rogue judges to halt the termination programs.
You cannot expect people to just turn off the lights and walk out. Large shutdowns must be organized and take quite a few people to do in order to minimize collateral damages. In fact. they will take some of the same people that you are going to dismiss afterwards.
Or maybe you don't care about that. Let the disgruntled ex-staff sabotage records and equipment and burn the offices as they leave. That could work too, but it would be much more painful and expensive than necessary.
Either way, the shutdown proceedings must be organized quickly and secretly, then executed quickly and without pauses.