Support calling OGNL expressions on headers accessed using in.headers[header.name] expression?

After spending a while trying to figure out how to get Camel to call an OGNL expression on a bean in the Exchange headers with the Simple Language, I discovered that I had gone about it completely the wrong way.

What I have is a header, "soap.headers.blah", which is an object. I wanted to access a property, prop, on that header.

Initially I tried ${in.headers.soap.headers.blah.prop}, which didn't work.

I then spent quite a bit of time trying variations on ${in.headers[soap.headers.blah].prop}, none of which worked. Now, the documentation never said that what I was trying to do would work, so I only have myself to blame for that, but I think it would be quite nice if the second form did work, so that in addition to having the following:

code
header.foo.OGNL
in.header.foo.OGNL
in.headers.foo.OGNL
code

I could also do

code
header[foo.bar].OGNL
in.header[foo.bar].OGNL
in.headers[foo.bar].OGNL
code

I don't know what this involves - I suspect it's not terribly straightforward - but it would be nice to have an option for accessing properties on headers whose names include periods.