I saw your PM.
You'll need (now) to first take the
multiengine ATP written. A prerequisite for this is a specific "airline training" ground and simulator program. This applies even though you apparently have some airline experience. After you have this and pass the written, you take a B737 sim program to add your type.
Not much is yet published about the airline training course. I'd contact here
EDIT: Sorry I just noticed you called these fellows already ...
Higher Power Aviation | Inherit a jet crew experience. Inherit the industry.
or here
Type Ratings, Boeing 737, A320, Flight Attendant, Dispatcher, ATC Training | Pan Am Academy | The Leader In Aviation Training
You're just going to have to wait until more is known.