Ah, there is the basic fact I overlooked! Yes, indeed, it's a 2636 non A. Thanks :) !
With these models, the triggering seems to be handled in a more "minimalistic" way.
I would like to build a custom list and trigger each list value individually via the GPIB GET command.
Upon reading the manual, this doesn't seem possible with ICL commands alone, but it requires a dedicated TSP script.