You might rush out and buy a T adaptor and a T ring only to find that no matter how hard you try, you can’t get focus. (Prime)
You can take photos using the Afocal technique but your only other option is to put the open throat of the DSLR over an eyepiece and try to get as close as you can without making contact with the DSLR mirror (Fold back the eyepiece rubber eye cup)
I did some research online and not many people are talking about a solution. Lot’s report the issue but not many have taken a hacksaw to Barlow lenses and T adaptors and experimented.
I found placing the element/assembly into the PST (The bottom Barlow lens is touching the bottom of the eyepiece holder) and then the adaptor to the camera, placing the camera to the PST I can get the focus I need.