Yes, it is possible. The frame would need to be cut by a gunsmith, and the new barrel would have to be fitted to both the slide and frame.
At that point, you will always be stuck with a ramped barrel.
On aluminum 1911s, I prefer a ramped barrel.
A steel piece can also be put into the frame where the aluminum feed ramp is at - no new barrel needed for that. Just a steel ramp insert.