Nobody has the crystal ball to determine if there is an entry classification manpower position for ANY specific individual. Compounding the predicting difficulty is pararescue is less than 0.01 percent of the total manpower positions by grade and skill funded by the annual DOD Authorization Bill that is determined by the U.S. Congress.
As 100% of funded Pararescue manpower justified and earned to directly support combat, other operational needs more so than career field sustainment needs downsizing hasn't significantly affected how many funded pararescue manpower positions exist on the books, other than during the period 1952-1955. From the moment of award of the Pararescue 3-skill level there is requirement and expectation this service member will maintain a high degree of proficiency in their duties as outlined in the Pararescue CFETP. Skill level will also be commensurate with their rank.
Consequently, changeability in total number of Pararescue manpower positions have historically had less impact on accepting and approving cross trainees as Air Force enlisted skill level, rather than grade, the primary indicator with regard to experience and/or effectiveness required to perform a task. The 5-skill levels and higher are directly connected to combination of: (1)increased experience and/or effectiveness required to perform a task, and (2) being there leading or training others (jumpmaster, dive supervisor, team leader, aircrew instructor, Flight Examiner). Unfortunately available duty positions decrease as rank and grade increases. Thus there is less need for TSgts than for SSgts, and less need for MSgts than TSgts.
.As far as the pipeline for cross trainees, the cross training student is TDY to the Development and Indoc Courses. At some point after these two courses are successfully completed there is a PCS assignment to the Pararescue School at Kirtland AFB, NM.