It would appear as if this is not possible.
I have 3 site collection reusable workflows associated with a content type and I want the first one to run when a list item is added, but then it will
run a switch statement and pick one of the other 2 workflows to run based on the inserted item's data.
I am aware that you can already use a conditional start which makes this need moot, but I am currently working on a special configuration case which
breaks this functionality. Until that case is resolved I need a workaround and I was hoping I could just to the described above, but the Workflow to start field
doesn't populate when I configure the start workflow block.
As I said at the beginning I don't think what I want to do is possible, but I need someone with more background to tell me it isn't so I can go fight with management =)