You are a candidate for any treatment from surgery to low dose implant.
My decision would be based on side effects , morbidity /mortality etc.
In HDR would they treat you in one session or would you have to to be implanted two or more times?
If they have to do multiple procedures I would go with Low dose brachy or external beam. One procedure or No procedure. The results are good whatever you do but the lowest longterm sequelae is with external beam and salvage of any local recurrence with surgery or implant is possible.