Repeating 11th grade to become a full IB student for the UK?

Hello! So if you’ve read my previous posts, you’ll see that I was in a dilemma in regards to my school cancelling its AP courses, rendering my 12th grade experience to being an un-fulfiling and unchallenging one. I am currently in 11th grade, and as an international student, I plan on applying to the University of York in the UK for law. UK universities, especially Russell Group Unis, are a lot more demanding in terms of their AP and IB expectations. I am taking an AP exam this year, English Language, and predict I will receive a four or a five. But next year, my school is lacking the AP subjects I’d like to have, so this was my question:
Will a university, such as York, frown upon me staying in school longer to become a full IB student? Technically, I will not be failing and repeating 11th grade. I am doing well right now, with a GPA of 3.6, but I will not be able to fulfil York’s AP requirement, which is three exams, with a 5,5,4 in each, due to my school cancelling the vital courses I’d need (AP Calculus, AP World History, and AP US History). If my IB counsellor explains this situation to the universities I apply to, will they see my rationale? My school is becoming an IB school, slowly cancelling its AP courses, but if I stay in school for another year, as a full IB student, I am expecting to better meet York’s standards and be much more challenged in the process.
I am currently in IB HL1 English Literature A, and will complete the course next year. Along with that, if I do take the full IB route, I will take Physics HL1, Math HL 1, Ab Initio Italian, SL Chemistry 1, and HL1 History. I will hence graduate in 2017, rather than 2016, as the IB curriculum requires two years of study.

Any insight would be much appreciated!