Probably not a good idea, since measles tends to increase risk of something going wrong in the immune system thus triggering autoimmune diseases.
We have drugs that do similar things to measles in the specific sense of wiping out “immune memory” but often in a more targeted, more controlled, and less “random” manner than measles. Like Rituximab or Daratumab that deplete memory B-cells in different ways. They are effective for some subsets of autimmune diseases.
For example Rituximab is the gold standard treatment for Rhematoid Arthritis (RA).
They should rebrand to the “Work or Starve” party.