Hopefully they would have to hire locally since most government workers would rather die than live in fly over country.. you probably wouldn’t have to change the budget much, rent etc is much cheaper in America and pay rates can be adjusted to local rates.
I’ve seen estimates of half the staff would be lost.
I hate to burst your bubble but 99% of FedGov workers are no different than you or I. They have the same concerns, worries, like, dislikes that the rest of us do. I’ve lived in NoVa in the past and can attest to this. They’re not cavorting monsters lusting to strip other Americans of their rights. They may be fools with their votes. Note 40% voted for Trump, so not a monolithic group. Also, another thing that people don’t realize. It’s been measured independently that amazingly Federal employees put in more hours on the average then comparable private sector. Nothing in that previous sentence says the job they’re doing is necessary, it just states that people in it work long hours. The necessity of the job is a different discussion. Also, roughly 1/3 of all Federal employees are veterans.