Thanks for the vote of confidence Lynn
Iminei, I usually do my repot for most of the succulents during Spring.
Except for the Aeoniums, I have learned, at least in my area, as seasons transition from Spring to Summer, it slowly goes semi-dormant here. So best to wait till mid Fall to do it for the Aeoniums. But the temperature prevalent in your growing area maybe different than mine, we get much hotter and dry conditions here, so there are succulents that do a rest period here as Spring to Summer conditions goes on. Our temps during the warm months here easily hover to a very dry 90F to 100F (32C to 37C) and higher. If your temps just hover in the 21C to 26C range, (69F to 78F) I think you can do your repot safely.
Sometimes Fall temps seem similar to Spring temps, so it is also a good time to repot, but I try to look ahead on forecasts, making sure it will not be a rainy one. Got to consider too that in Fall, daytime hours are shorter, that is why Spring is still the preferable time, with daytime hours slowly going longer duration.
If you are growing them indoors during winter, yes, the windowsill is good for them, just not too close to the glass, it will be cold in that zone. Some augment their lighting indoors with grow lights, if they lack space at the windowsill. There are lots of threads around here in NGA about the grow lights some growers use. I am fortunate enough not to need one, our winters are relatively mild, but I still move some of my succulents and we have a big window with south facing orientation.
I am looking at your photos, to me they still look good in their current containers. I will give them another year before I repot. But do bring in your Euphorbia, as I have said earlier, I find them happier kept warm.
Aeoniums do tend to be top heavy at times, but when it starts to shed leaves when seasons transition from Spring to Summer, it will be lighter and have a long neck remaining. You can choose to cut them and keep them dry, leave them alone, they are partially dormant then they resume active growing in Fall. Or do the stem trimming in Fall, let the callus ends dry and it will regrow new leaves at the cut end. That way you can keep the height at a manageable level.
It is really cute when they grow new rosettes at the cut ends: