Hi, my name isXXXXX and I am here to help you today.
Your 'amateur diagnosis' does sound correct that the black scabs are likely to be a skin cancer called squamous cell carcinoma.
This is a type of cancer that will continue to cause bleeding scabs which will drop off and then ulcerate again. This will continue.
If a trip to the vet to have the areas surgically removed/trimmed is not an option
then you need to be bathing the areas once a day with warm salty water to try an ensure they do not become infected.
This type of cancer can spread to the throat and the lungs.
So you need to be watching for signs of not eating, unwell or coughing.
If these occur you may need to consider a trip to the vet then,
Please let me know if you have further questions.
would daily washing of Betadine solution @ be more beneficial or detrimental to stopping any possible infection
Betadine is not ideal in cats as if they manage to lick it - e.g. rub the ears with their paws and then lick their paws. Warm salty water is better.