Your initial question (how to draw out external tumor) reminded me of something I had read in a Dr Shultze remedy some years ago (he is also covered on this forum extensively).
Shultze teaches about the use of poultices for external conditions and you might want to check into the use of either a garlic or ICF #2 poultice or possibly something else appropriate.
ICF#2 in particular has a pharmacutical grade charcoal in it that draws out 1,000 times its weight in toxins (usually from the intestine but I think I have heard of it being used externally to draw out toxins).
I admire your dediction to the natural solution to this in spite of the odds and the contrarianism approach that gets a rise from the medicos with their poor nutritional and physical education.