My problem is that I'm being continuously evaluated on the basis of my publications and the future of my position literally depends on this evaluation every yea

My problem is that I'm being continuously evaluated on the basis of my publications and the future of my position literally depends on this evaluation every year. I have to get as many publications into as highly reputed international journals as possible if I want to have any chance at getting a permanent position, and the vast majority of all reputable journals in my area are behind private paywalls. There is a maximum of 3 reputable, fully open journals and they are still not as prestigious as the established ones. If I decided to only publish open access journals from now on, that would be immediate professional suicide. According to our institute's internal regulations, I'd be gone in two years from now, maybe even in one if they interpret their rules more strictly.