Tilt lenses for 35mm are available, but they are very expensive, as much
as some lower end camera and lens combos. They give a limited degree of
perspective control. But your idea is a good one; the scheimpflug
effect (yes that's really it's name) will allow some adjustment of focal
plane. The trick is to bring an imaginary line from the back to front
of the subject and the lens, and the focal plane of the camera into
alinement so that they covererge at an imaginary point below the camera.
It works.
That word should be "converge" in the line above. It's awfully early.
J. Del Col