Seeking help with fusarium treatment

[chickazilla]

Hello experienced and wise orchid growers! I am sending out an SOS for help with treating one of my orchids with fusarium - the Myrmecatavola Frances Fox, which I absolutely love. In the process of repotting, I checked it for fusarium b/c she was showing signs of weakness, poor root growth and black marks on new roots, etc... She is indeed infected. I read an article which advises that you keep cutting into the rhizome until you don't see the purple ring, before repotting, but I fear I would be down to only two pseudobulbs.

I'm so conflicted about keeping the four pseudobulbs or do as advised and keep cutting until I land on a healthy rhizome patch! My plan is to do foliar treatments with thiomyl. I would appreciate any words of wisdom. Thank you.