Select machine present at trigger time

We run jobs for retailers with various size catalogues, and it’s very wasteful to run the smallest retailers data through the same preset as a large retailer.

Currently, I don't see a way to provide the machine preset at trigger time.

At a minimum we should be able to provide the machine at trigger time. Or even better rules maybe based on metadata?

I could see a path where as metadata I could provide an estimated job complexity. In the dashboard we could setup rules like

WHEN task.metadata.complexity > 5 THEN medium-2x

WHEN task.metadata.complexity > 10 THEN large

DEFAULT small-1x