Hello chiro, thanks for the follow-up.
My situation is as follows: I am currently doing a one-year masters in physics and I plan on doing a PhD in physics, but I would first like to do a one year master in math to cover some general areas (partially because I love math for its own sake, and partially because I plan to work on the mathematical side of physics, like for example Penrose, in which case a firm knowledge of pure math is handy). Courses I am thinking of are differential geometry, algebraic geometry, algebraic topology, differential topology, Lie algebras, homological algebras, (non)commutative algebras, category theory; this list is not at all fixed but it should give a sense of what I am looking for. Tripos III seems exactly what I am looking for, since it consists purely out of courses which you can pick freely out of a wide range and the program lasts only one year (taking two years out for math is too much for my taste). I also have good grades and I already got accepted into Tripos III last year (but dove into a physics master instead) so it seems realistic that I can get in this time too. The two downsides is on one hand the cost, but this is not much of a downside: I can get the funds and if it is worth it, it is worth it; more importantly I hear the exams are mainly parrot tests (do correct me if I was misinformed on this one, although I have had it confirmed by multiple sources), which is a big put-off in my view.
I am originally from Western (continental) Europe, now I am one year in Canada, and I am open to any country for the one year master (although I suppose the PhD consideration doesn't really come into play since I am not going to do a PhD in math, but rather in physics). Countries I have for example already looked into are the UK, Germany and Sweden, but I can't seem to find something.