You're so young to be going through this. But you sound strong and doing the right thing I think by taking control and doing your research.
I found reconstruction very difficult and slow to find what was possible, what i was suited to, who could do it and how the system works.
I saw 4 plastic surgeons before settling on the 5th on to do my free tram. Unlike you I have 2 kids and had tummy fat/tissue to spare. I found the surgeons specialised in just a couple of procedures, rather than offering all types. I suppose it makes sense so they get really good at their technique.
I didn't look into those procedures, TUG and GAP, but read a bit about them on mostly US bc websites. I guess you'll always get a range of experiences.
I found searching this site from the search box at the top helpful. I found members posts about methods and hospitals and doctors. I also learned that doctors work public and private so followed leads that way too. I talked to the breast care nurses and the cancer council, I phoned plastic surgeons rooms and asked questions (cheaper than having an appointment to be told they don't so what I was looking for). I read read read and finally found my team.
Good luck, I wish I could be more helpful,
Xxxlouie