You can obtain an MCC exemption (500 hrs needed) if the operation requires 2 crew. An example is Flight Inspection work where, under ICAO Annex 10, the task requires two pilot operation. Under these circumstances the hours all count towards ATPL issue.
However, the B200 and even the B1900 are certified single crew. The Jetstream 31 is lighter than the B1900 but certified Multi Crew. So you can get a JAR ATPL(A) on the Jetstream but not on the B200 or B1900.
To have the ATPL issued requires a skills test on a MPA / Sim.