Also, for those who’re wondering how to deal with the RTC at the moment, I’ve posted in this thread how I added one salvaged from another board. It’s really tiny and painful to deal with (I love soldering small stuff so that wan’t that much of a problem, just a matter of patience):
However in parallel I’ve ordered this RTC on Ali which should be exactly the same and which also integrates the battery:
It will just require desoldering the connector, and will be small enough to fit, supposedly with a 2ppm deviation (advertised). And with the same driver, I found a cheap SOP8 version of the HYM8563 whose manual soldering will be pretty manageable:
(yes that’s the price for 10pcs, roughly 43 pcs each). I’ll see if I can manage to make some small boards for it.