Make the gun to suit your desires, assuming you plan to keep it for a reasonable length of time.
To RR: Chokes are normally opened up with a reamer or by honing at the muzzle. This leaves the original taper as it was but with a longer parallel section. The taper of course, is shorter, but the same angle.
I doubt that anybody has the equipment or the inclination to mess around with the original lead-in to the choked portion.
Mike O. might add to this thought.

> Jim Legg <