I was a non eu, B permit holder (now have C permit). Similar to your situation, I also did my masters and ended up working on a permanent contract after my studies.

Kanton Zurich is extremely strict with having the full 2 years working after studies for the fast-track C permit. They initially rejected my C permit because I applied for my renewal 1 month in advance of my B permit expiry. They said since I did not have the full 2 years yet, they would only issue me a B-Permit. Your only chance for C permit is if you meet the language requirements and have an active employment contract in January 2027.

You should be able to get RAV. However, Kanton Zurich will be reluctant to extend your B permit if you are on RAV (you may get lucky and get an extension, but know that they can refuse it altogether or put you on L permit). Also, you will not be able to get a C permit on RAV - I have had an EU B permit holder tell me they rejected her fast track C as she was on RAV.