As it turns it isn't too bad after all. Took a few retries as expected but I've now solved your level. And actually it wouldn't have been too bad to do in Custlemm either even though it has no replay feature. But you said the trick doesn't work there? That's too bad, oh well.
"Semi-original" certainly describes the trick dead-on.
And like any good levels, your level actually led me to conceive of a totally different trick that I might use in my levels someday. (Don't worry, the trick won't work in your level, so there is no backroute.)
Anyway, neat level, a nice one for the brain and eye. B)