I've done some initial investigation into the Linsn mini901 card, seems to be a bare bone version (no driver chips, Ethernet transformers).
Pin info and such are in spreadsheet if anyone is interested.
Possible carrier board, untested as of Nov 4, 2023 but on order.
https://www.proto-advantage.com/store/product_info.php?products_id=2800072
Used a FT2232 board for JTAG & https://github.com/alexforencich/ftjrev to workout pin mappings.
https://github.com/ozzyrob/Linsn-Mini901/tree/main