Glen,
If all those reducers are designed specifically for the Edge HD optics then, either would work.
The fixed backfocus distance seems to be 105mm.
http://www.celestron.com/browse-shop...-7x-edgehd-800
So you'll need to know the backfocus of the camera and work out a series of spacers.
I use an "on axis reflective guider" - a reflective slit plate on my C11 at f10 with a Lodestar camera. Similar to a "good" (I mean robust and rigid!) OAG set-up, works 110% for me.
Hope this helps.
(EDIT: I couldn't find the TS 0.67 version???)