Would fabbing your own at JLCPCB, PCBWay, et cetera, with gold fingers be out of the question? 1U ENIG 1.0mm thick plus gold fingers at JLCPCB would cost about $30 for 10 plus shipping.
EasyEDA has M.2 A+E card modules (
schematic matching the
pinout with the exception of reserved pins 59,61,65,67 having the PER and PET names swapped, and 2230-sized
board) which would make it very easy to do.
You need to route pin 3 to D+; pin 5 to D-; pins 1, 7, 18, 33, 39, 45, 51, 57, 63, 69, 75 to GND; and obtain 5V USB from somewhere. The M.2 A+E only has 3.3V available (on pins 2, 4, 72, 74). You could easily add a Microchip USB251xB USB 2.0 hub to the card to extend the number of USB ports; see the
PCB Layout Guide for USB251xB ic's. JLCPCB even has USB2514B-AEZC-TR (4-port) in stock for assembly for $1.5 apiece, so you could have these fully made for you.
Otherwise, try adding "NGFF" to your search terms as an alias for M.2. That way, you'll find stuff like the
M.2 A+E USB 2.0 dual-port hub. I am a bit suspicious about EMI and EMC noise from their 3.3V to 5V boost converters, though.