If the fingers of the press can be adjusted to the proper angle and the press closes small enough, there is no reason why it should not work. Another press that has the adjustable fingers and closes to 6" is the Sniper Pro 5.1 which is a newer press and higher quality.
This press will work in the following positions: vertical up, vertical down and horizontal. It can be purchased with accessories for string and or cable building or string serving. This press can be set up as shooting machine for vertical compound bows by using a remote trigger so one does not tilt or cant the bow.
Most bow presses, the riser has to come off the crossbow for string and or cable change or tuning, not so with this press. With care, I have removed the axles and swapped cams with this press with out removing the riser. Another advantage for me, my Barnett Ghost 410's and Barnett Buck Commander BCXtreme 365 Ultra Lite are set up with the modified Ten Point String Dampener System which fits into the "J" groove where the cables fit. If I have to remove the riser, the Ten Point System would have to come off first. Being I use the Sniper Pro 5.1 press, I am able to remove and install the cables with out removing the riser.
This greatly speeds up the tuning process, being the riser does not have to be removed.
The Sniper Pro 5.1 press would illiminate buying the Ravin press that up until what you explained in Post #1 was limited to the Ravin crossbow only.
Thanks for sharing.
All the best.