celestron photo adapter for 4SE

[oobydooby]

I have recently acquired a Celestron 4 SE, which can be used for astro photography as well as visual astronomy.

The illustrations in the instructions shows an adapter port attached to the back of the rear cell to connect a camera.  This allows a 35mm/DSLR to be attached.

This telescope is used primarily in outreach and would be better if I could attach an eyepiece to this port thus keeping childrens' heads clear of the finder and  eyepiece port which is permanently fixed to the top, at least I have tried unscrewing it but am careful not to try too hard for fear of breaking it.  

Has anyone any ideas of how this can be achieved?

Thanks