I should have mentioned: This is not a “Real life flying question” just a legal question.
ATC, however, is supposed to keep you on a vector until you are within the service volume, as I read the 7110.65:
5−6−2. METHODS
e. Provide radar navigational guidance until the aircraft is:
1. Established within the airspace to be protected for the nonradar route to be flown, or
2. On a heading that will, within a reasonable distance, intercept the nonradar route to be flown, and
3. Informed of its position unless the aircraft is RNAV, FMS, or DME equipped and being vectored toward a VORTAC/TACAN or waypoint and within the service volume of the NAVAID.