Is there a gentle way to treat pml?

NO. Pml is caused by the jc virus. It can lie dormant in an immunocompetent host for a lifetime. In the immunocompromised host, pml is uniformly fatal without reconstitution of the immune system. There have been several reports of antiviral agents being used to treat pml in immunocompromised states, the numbers are very limited and the treatment is not gentle. To answer your question...No.