I am also guilty for repeatedly trying to replicate a perfect item that fell apart. Sometimes 25 years later! Some items (often complete with people and the situations) remain lodged in my memory. And maybe for this reason it's never quite possible to buy a replacement...
Volte, I also mainly work from home. Having grown up and lived in a few northern countries in modern, well-built and well-insulated housing with central heating, I can honestly say that I have never been as cold as in Britain. After having lived here for so very long, I can tell you my rules. I accept;
-that I have to wear something woollen on my upper body from September to June;
-I often have to wear two woollen things when sitting down to work and I often have to take things off when going out (rather than putting things on);
-that, consequently, I have to have dozens of jumpers/cardigans/etc in various weights, colours and knits. I have summer jumpers that are thin and, say, red / pink; I have thicker knits for winter and black, a whole autumnal collection, etc
My advice therefore is;
-wear something light (still a jumper though) with interesting neck line for zoom calls;
-wear a thinner jumper and a thicker cardigan for sitting still for those hours;
-to not die of boredom, play with colour / knits / silhouettes
And the last thing, I found Margaret Howell knitwear unbeatable. She seems to understand English weather like no other brand and produces knit weights for specific English/British? conditions (or perhaps just sticking to historical knits developed in relation to their environments would do so as well). There are thick winter ones and thin summer ones and very useful mixes of wool/cotton when it appears to be warmer but not really. MH also does lots of interesting necklines (slightly rolled ones where you can see the shirt a bit, or a lower cut on a cardigan, etc). And it's possible to buy her knitwear on eBay/vinted. Things come up - not very often, but they do.