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I had no trouble getting the UDT999 last year. It's basically just a cable and software so supply issues probably are not impacting the UDT.
Here is a screenshot of my Dell Mini while it was connected to my 964 with UDT.
Tore B's web site has the OBD software for free download and he sells the 19 pin OBD1 cable. I have used it to clear the airbag code when I was having the same airbag/seatbelt light problem. https://www.bergvillfx.com/categories/downloads