Given the current nature of our highest court, it likely will be found constitutional.

Pretty much. From the strict text reading there is nothing about it.

and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.

Justice Thompson will get a new boat from a GOP aligned group so at least so it isn’t all bad. Sure it is travesty of the justice and breaks the entire concept of no one being above or below the law but when has that stopped the Robert’s court before?