Morphing abilities question

[elm0]

How do you give a morphed unit another set of abilities when morphed and hide/disable the normal form's abilities? And remove/hide them after the morphing(metamorphosis, etc. ) is over?

 

[Death Adder]

I think normally you use bear form if you want the unit to change abilities, but im not sure you can have it not be permanent.

In the case it can't be timed maybe you could have a dummy ability and when it's used you add and remove a reversed bear form which would make the unit instantly change to the other unit type (because wc3 would think that it's normal unit type is the morphed unit type) and then with a timer do the same thing again but now to turn it back to normal.

 

[elm0]

Is it possible that I add the morphed form's abilities and just disable them when the unit is in normal form?