Brilliant bit of work, Rolf. You deserve all the accolades and them some
I was thinking...you know that the GStar mono camera has a very good IR response. I wonder how it would go at attempting such an image?. You might want to have a little look into trying one out and see if it works. A mono Flea would also be good. Speaking of IR pass filters, you could try Astrodon's IR pass filters. They seem to do the trick.