Sorry, but i thought the idea with drift scanning was for the earth to do the rotation, and your telescope just records along that elevation, with the mount aligned to normalise the arc as much as possible.
To me its a flipped application of solar tracking math, the sun traverses arcs in the sky from horizon to horizon, which reflects the tilt of the planet. and your location on the tilted sphere, by just rotating on the RA each day, and fine tweaking the declination each night, you can keep a panel perfectly pointed at the sun,
In a drift application i would imagine the RA would be fixed, and you would just change the declination as the planet rotated around the sun, if you wanted to instead actively scan the sky, then i could see you scanning declinations while maintaining the same RA each night to get the widest scan pattern possible, however i am not sure how long you need to point at a spot on the sky to get a good reading,