Grant, you don't need to buy an Astrograph to do Astrophotography.
Almost any scope will do, as long as it will reach focus on the camera chip.
But to answer your question, no you won't need to mod an Astrograph to do visual.
All you will need is an extension tube (an Eyepiece will do with the lens taken out).
Extension tubes are cheap.
All it is is a tube that you put in the focuser, then you put your eyepiece into the tube. It just moves the Eyepiece away from the scope
