There are 2 issues I would comment on.
First the testing for progression. Several comments have been made that I agree with. However, there are other modalities that have not been mentioned. If you are thinking of getting a 2nd opinion re testing, I would rec a high level cancer center like Mayos that would have access to all testing pertinent for MUGUS.
The second issue has to do with treatment. Again, I would agree with the comments that have been made re treatment. Certainly, you would not want potentially toxic treatment for a nonmalignant condition. On the other hand, there have been homeopathic treatments that have slowed the progression of MUGUS without any toxicity. An example is curcmin. If you are considering one of these, it would be important to discuss it with your oncologist.