Chris,
Many thanks for posting those. I have seen half black undersides on 110's before so it's certainly plausible that there should be 109's dressed up like that as well. It looks very striking too!
One of the G-10's at Kjevik was an R-6 I believe, at least it carried the gondolas.
I guess you would have written if you had any other references but it would be nice if this was a verified paint scheme.
I'll probably go for something like this on my Messerschmitt.
Kyrre