Keep in mind that preëmptive pardons have not been upheld by the courts [1].
reply[1] https://www.criminallawlibraryblog.com/preemptive-pardons-co...
If that reached the supreme court however, precedent sadly might not matter too much.
reply[1] https://www.criminallawlibraryblog.com/preemptive-pardons-co...