[Spell] How to make a unit invisible with a custom transparency setting?

[MasterWarlord]

I want to make my unit have 100% transparency while also being invisible. Wind walk/invisibility/perma invisibility all force the unit to have a certain amount of transparency in-between 0% and 100% somewhere, and using the trigger setting of setting the unit's transparency to 100% during this time will not work, even if I am constantly setting the unit in question to be 100% transparent every 0.03 seconds.