If you are looking at surgery locally, you could ascertain how long waiting time could be, even book a slot. Meanwhile, you could see an oncologist for his/her opinion based on your scan(s) and histology. Should you then decide on one of the forms of RT, you could remove yourself from the waiting list for surgery. Almost always HT is started before RT as this constrains the cancer and helps shrink the tumour thereby asking less of the RT to deal with. HT was not generally given before surgery but due to the longer waiting times this is now sometimes given as a prelude to surgery too.
I would also ask your Oncologist whether you would be suitable for high or low dose Brachytherapy, in need with External Beam Boost. You might have to go to another hospital for this if your present hospital doesn't offer it. You seem to have done some research on this and together with the views of your consultants as to suitability, should help you decide your treatment preference.