Claude was kind enough to send me a spare PCB and some parts he used (the antenna and xtal were the parts I didn't have). Here are some pictures of the built.
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I couldn't test the board (but Claude assured me his was working O_o) due to private circumstances. I hope to do so this weekend. Everyhting looked fine, but I ordered some bare ESP chips and flashs from mainland china, so perhaps it will end up tricky in the end