Oh, it's a good try. A lot of Brits would spot the missing L and not the inappropriate "trespass".
Interesting that the roots of the word simply mean "passing across": English has added the sense of prohibition. Anglo-Saxons probably heard it first in Norman mouths when being kicked out or worse. In French it means "to die" - the "passing over" of spiritualists and the like. Someone French with a smattering of English might find that sign quite amusing.
When the Angel of the Lord slew the firstborn of Egypt during the first Passover, was he trespassing? Maybe not, but they did.