First of all let me say how sorry I am that you and your wife have been through so much with her skin cancer. This is probably a frightening and frustrating time for you.
Now...has a doctor said officially that this is cancer you are seeing on her nose?
Please know that I am not a doctor and that these questions really do need to be directed to your wife's doctor. I will give you what information we have about treatment and I will research about ways maybe you can get some affordable treatment. I would not mess around with any unproven methods as time is wasting and if this is cancer it will need to be treated by a doctor.
Our Doctor Kevin Berman talks about these different ways to treat skin cancer:
"Excision with 4 mm margin results in 95% cure rate and the excised tumor is sent to a pathologist to ascertain that the margins are clear and tumor has been completely removed. Mohs micrographic surgery is reserved for tumors on the face or very large or recurrent tumors. However, many tumors do not penetrate very deeply into the skin and can be treated with a destructive modality known as "curettage and electrodessication." In this method, the tumor is curetted with a very sharp instrument and then "burned" with electricity. No stitches are placed and no specimen is sent for pathology. This also has approximately a 90% cure rate when appropriately used for tumors that do not penetrate deeply.
More recently, topical creams have been used to treat superficial forms of basal cell carcinoma and squamous cell carcinoma. 5-fluorouracil and imiquimod are two creams which have been shown to effectively clear superficial skin cancer when used daily for several months. While the cure rate is not as high as surgical excision, this remains a viable option for a patient who is not a good surgical candidate. Radiation is not commonly used but can be an effective treatment."
Also you might want to read this page for more information about skin cancer treatments.
This American Academy of Dermatology web site gives information about free skin cancer screenings.
Also here is a link to a free clinic finder for your area.
See what these resources have to offer and I truly wish you the best. Please do get your wife to a doctor somehow...better safe than sorry.
Thank you for your question.