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You should be able to get a single star to focus. One thing you can try if moving the eyepieces up and down doesn't achieve it, is turning the eyepieces around within each holder, and adjusting the distance between eyepieces. At the end of the day, the binoviewer has to be collimated exactly like binoculars - when you alternately open and close each eye, the image shouldn't be jumping around, else you'll get a headache.
Not sure about using the star diagonal. If you put the Barlow into the diagonal the binoviewer won't come to focus. If you put the diagonal into the Barlow, the magnification will be a lot higher, but should work. Maybe, if your diagonal has threads, and if your Barlow unscrews at the bottom and has the same thread, then you can screw the bottom Barlow lens into the diagonal - and that may work, or may not.
Regards,
Renato
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