Unselectable but still targetable (by spells)

My last post on this issue was deleted due to the "hack" so i'll give a go at it again, how do you make units that are unselectable but still targetable. Locust doesnt seem to work, because I let the computer attack the locusted unit with a spell (chain lighting) but it doesnt work.

note: The unit is in a variable so its not a select units in region kind of flaw.

Unselectable but vulnerable:

Custom Script : call UnitAddAbility( unit, 'Aloc')
Custom Script : call UnitRemoveAbility( unit, 'Aloc')

Unselectable, vulnerable and targetteable:

Custom Script : call UnitAddAbility( unit, 'Aloc')
Unit- Add (Chaos morph) to (unit)

** Chaos morph is a chaos based spell that has no tech requirements and morphs the unit to the same unit.

Wow, so it is possible, thx. But my units come with locust (so i dont need to add it), is that a problem? And i'm guessing that ill have to take the Chaos morph way, so is there a way to add them to each unit in a loop because the trigger would go a little bit like this then (if it was no custom script)

for each integer A from 1 to 8 do:
add ability chaos morph to outerpowerballs[for loop integer A]

for each integer A from 1 to 6 do:
add ability chaos morph to secondlinepowerballs[for loop integer A]

and so on down to 1

Well, do you NEED to use that custom script way because there is a unit - add ability function...

I think it works without custom scripts, maybe he forgot add ability in GUI came with 1.10...

I'm having 2 things in mind:

1) pick all units in unit group of unit-type powerball owned by player 1.
add chaos morph to picked unit (i just deleted the requirements (chaos) and changed the data - new unit type to PowerBalls.)

2)Let them have the Chaos Morph ability form the beginning like Locust, but researching the upgrade. This does raise the question, since i recreate those units everytime, will the next 'wave' of PowerBalls also be targetablle by spells???

What would you do?

Nevermind I found a good solution --> morphing into the same unit that doesnt have locust.