Although I have not had an issue with rot, I do this for any orchids with few / none viable roots.
I use cheap tubberware from the dollar store or left over take out containers and just punch a hole or two to avoid mold issues. I open it up every day for a few minutes to let it air out. Then I use a paper towel and moisten (not drench) it with diluted rooting hormone (as recommended on bottle). I wrap this around the the area below the lowest leaf and put it in an area with low light. Good luck!
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