Looking at the pics again, I think if you can control the scale, your trees will be just fine until summer. Good looking soil. The more light you can get these the better…you just have to stop the bugs from sucking it dry. They don’t look terribly unhealthy, just bearing the burden of the scale. I would not get too drastic, the goal is just to limp them through until spring.
If you really want them to thrive over winter, you will need grow lights.