Is there any way to spawn a blind unit?
None.
An artist's depiction of an Extended Unit Death
No, you'd have to devote a section on your map where a medic blinds the unit, and then move the unit where you want it.
Someone please post the hp requirements to force a medic to blind; I forget them.EDIT: Oh, nevermind. Here's how you blind units
http://www.staredit.net/?p=tutorials&tut=29Medics are far more inclined to blind units with 81 or more health, and when the medics themselves are not invincible.