Make Structure Uncancelable

The tile should be pretty self-explanatory. Is there a way (simple or not) to make a constructing building uncancelable?

Thanks in advance.

Adding locust at the start of construction and removing it right at the end mght work.

The catch is that it probabbly wont work with Human type construction.

Two possible problems that I can think of:
*Locust can't be removed, right?
*This also makes the unit unselectable, which is not really desired.

change the player? idk if you can help other people build their builds or not

I guess I could give it to Neutral Passive during construction, let me try it out and get back to you. Thanks in advance.
Edit: Works just fine. That I didn't think of this myself, oh well. Thanks a lot.