Last night I made another attempt to come to focus with my binoviewer in the XLT 150. I took the stock 1.25" adapter out of the focuser and inserted the low profile adapter from my Paracorr. I put in the binoviewer and tried to focus on the Moon from a window in my house. I used the same eyepieces as when I binoviewed the Moon a few nights ago.
None of them would come to focus with the binoviewer in native mode. Not even close. Maybe if the 2" focuser were replaced with a low-profile it could be done, but I doubt even that would work. Anyway, I don't think it would be cost-effective. I'm not doing it. As I said, I've never had a Newt that would come to focus with a binoviewer without using a Barlow or OCA.
Last night I was playing around with my 8"f6 tube dob using the binos with no compensator.
I pointed the scope at zenith and with the primary sitting on a "pedestal"[a paint can] I slid my tube down till I could reach focus.
The primary wound up 4" in from standard position. When I put the numbers in newt for the web, I'll have to change the secondary from 1.5" to a 2.14" to get 100% light.
So if you want to use the binos with no compensator you'll have to use a different cell mounting plate that allows you to move the primary a lot closer to the secondary [4"]. I'm sure your stock secondary is big enough, they tend to oversize them...