Hi BH,
I'm sure you must know that graduate entry medicine is a tough and Highly competitive course to crack admission to. Even if schools were to consider your 2:2 without a masters , ( which is not really likely in the UK)you would still need a really good healthcare related CV, the funds to sit GAMSAT, and then to be successful at interview. Above this, funding may also be an issue; it used to be the case that no funding was available for the first year of study, so you would have to stump up fees and living costs yourself, though this may now have changed; either way, its something to think about. Its also long, very intense and stressful course; are you up to such intensity so soon after your degree in Architecture?
I have no idea of entry requirements abroad I'm afraid, but this does not diminish the competitive nature of admission, the intense nature of the course, and the issue of funding, now coupled to the fact that you will be studying in another country with a different medical outlook and culture.
My advice would be to have a chat with some school admissions and see what they have to say, but don't be surprised if they are not enthusiastic, or ask you to go off and study for a masters. If you are determined, you will take on board their advice.
Sorry I cant be of any more help.