Force Remove Unit from Training Queue?

[Spellbound]

I've been trying to limit unit training per production building ([ulr=http://www.hiveworkshop.com/forums/triggers-scripts-269/limit-number-units-per-building-279537/#post2830247]This Thread[/url]) and the initial solution is to order the production building to cancel. This doesn't seem to work, however, so I was wondering if anyone has ever discovered a way or some sort of loophole to remove a unit from a build queue?