Got it figured out!
Scenario: One DID number on the PRI should go directly to the Minuet ACD Group 1, bypassing the AA or manual operator. The ACD should pick up that call directly.
Solution:
In Minuet's Line Configuration, I went to PRI. As PRI digit string I entered the last 3 received digits of the telephone number (in my case 554). Then assign to Group 1.
Then, in Norstar Line programming, assign a target line with the telephone number as the name (here:2423554, or tech support or whatever), then on the recvd digits leave clear, set prime set none.
Et voila, we have a working solution. I'm not sure whether the Target line programming is necessary at all, since the ACD looks for those 3 digits and seizes the line, but it works this way, so I ain't touching it again.
I'm trying the same with a Cinphony with PRI, but it's not quite there yet with the DNIS function. Any suggestions on that?