@robimarko I'm trying to talk to the LM63 on my DGS-1210-28MP and I've run into the same problem. Did you ever get this sorted? Unfortunately, I discovered your posts just now, after having tried the same things.
As a bonus, however, I can confirm that the SFP GPIOs are the same as for the DGS-1210-52, enabling full SFP support on this switch.