For crimes like this it isn't a matter of "reform" in the same way as when dealing with regular anti-social behavior by individuals. These are people who have been given huge amounts of resources and trust then betrayed us all. I would be very happy for them to be permanently banned from any position in government for the rest of their lives. Instead, nothing happens to them and they fail upwards.
Mandatory sentencing would require a guilty conviction though.
And we can pretty much guarantee any high-level judge who starts handing out guilty verdicts to high level government bureaucrats will swiftly find themselves unemployed, or worse, and replaced by judges who don't do that.
It seems to be the closer we look at high-level government bureaucracy the more similarities we see with organised crime.
...will swiftly find themselves unemployed, or worse...
In USA, federal judges are appointed for life. They may be impeached by Congress, but the general public will notice when Congress impeaches the first judge in living memory who attempts to impose the rule of law on the bureaucracy. It will take a change of heart, however. Anyone who has any inclination in this direction would never be appointed in the first place.
Mandatory sentencing removes any possibility of judicial discretion.
And then there's the problem that gaol tends not to reform people.