ios7 + swift: Javascript strings with inline Swift code

Question

I'm looking for an "inline" way to run native Swift code from Javascript strings. At the moment, what I do is as follows:
I've extracted the JSContext from my web view, so I have direct access to my javascript environment:

var jsContext = myWebView.valueForKeyPath("documentView.webView.mainFrame.javaScriptContext") as JSContext

Once I have my context, I'm setting a new object in it to call my code block:

var codeClosure: @objc_block ()->() = { ()->() in println("this is my swift code closure") }
var casted: AnyObject = unsafeBitCast(codeClosure, AnyObject.self) as AnyObject
jsContext.setObject(casted, forKeyedSubscript: "callMySwiftClosure")

Which enables me to call my code as it's a regular javascript function:

myWebView.stringByEvaluatingJavaScriptFromString("callMySwiftClosure()")

That's pretty simple, and works very well.

Now, I'm trying to figure out how can I "inject" the swift closure directly into a javascript string, without explicitly creating a new object in the JSContext. Meaning, I'd like to be able to do something like that:

myWebView.stringByEvaluatingJavaScriptFromString("\(codeClosure)")

Any ideas on how to do that?