Incredibly enough, that little DP to eDP board just works:
I picked up a version that comes with a cable (https://www.aliexpress.com/item/1005003740168811.html?spm=a2g0o.productlist.0.0.28d82d8a5LVD2X&algo_pvid=463d25b7-61cf-4cdb-b401-ffb743a04382&algo_exp_id=463d25b7-61cf-4cdb-b401-ffb743a04382-0&pdp_ext_f={"sku_id"%3A"12000026997195858"}&pdp_npi=1%40dis|USD||28.38|||||%400b0a555416516796002377603e9574|12000026997195858|sea). You need to carefully remove our custom eDP cable and then insert the cable that comes with the adapter board.