You don't currently do the EPQ, right? I'm not entirely sure, but I believe that would start in the summer. I think you're "planning" to do the EPQ, though I could be wrong!!
If you're not currently doing an EPQ, I'd drop it from your list and self-study Physics, assuming your school wouldnt let you take it as an actual subject. Don't get me wrong, an EPQ is lovely! But if Physics is required and an EPQ isn't, I feel like it would make more sense to take Physics formally, and just write reports on things you like as a supercurricular.
If you ARE currently doing an EPQ, be aware that you're essentially doing 4.5 subjects, when most people struggle to do 4 on their own! It's possible, especially considering you're in Year 12, but you've got to catch up on 4 months of the Physics A-Level + you've then got to get working at a regular pace, comparable to those who don't self-study. It's certainly possible! But you really gotta work for it.
It might also be worth it to look into making your EPQ Physics-focused, and seeing whether Universities would still consider your application? This is more applicable to Humanities/Arts degrees, but I contacted University of Manchester (Which for their Japanese BA, would require an Essay subject), and they were fine with me doing Maths + FM + Comp Sci + EPQ focusing on languages. Obviously it's a harder ask with Physics, but it's still worth contacting Universities!!
Regardless of what you do, contact your Physics Department and start asking about the feasibility of self-study. They'll know whats best, because that's their job. Good luck!!!