They should not be executed or imprisoned. They should be sentenced for life to toil in service towards the betterment of the lives of Cambodians. They should be fed and given mediacal care but everything else should be toil. If their repentance is sincere they will accept it gladly and fully until their dying day.
We all know what power governments have over the lives and thoughts of ordinary citizens, these repentance should be given the chance to prove their rejection of sins before they meet their maker.
Let them live the life of the penitent monk toiling for others until their dying day.
If they are true Christians, conscience will be their master and they will stoop to the service of the next generations. No physical prison or jail will be needed.
But again that would require the dropping of the “Schadenfreude that feels so good.”