Well if they got the excellent William Fichtner to play "Bank Manager", perhaps Anthony Michael Hall will be "Wayne Enterprises Technician #3".
But really, who could he be? Scenes with Morgan Freeman. Would suggest a Wayne Enterprises employee. Roman Sionis perhaps? Not too sure about that. If we're getting Two-Face in part three (which seems highly likely) I don't think there's really much need for a Black Mask.
Perhaps he'll just be playing a character created for the film - like Earle - who is on the Wayne Enterprises board?