In conclusion, Can I use a racetrack in these situations?
AIM 5-4-9
1. On U.S. Government charts, a barbed arrow indicates the direction or side of the outbound course on which the procedure turn is made. Headings are provided for course reversal using the 45 degree type procedure turn. However, the point at which the turn may be commenced and the type and rate of turn is left to the discretion of the pilot. Some of the options are the 45 degree procedure turn, the racetrack pattern, the tear-drop procedure turn, or the 80 degree $ 260 degree course reversal. Some procedure turns are specified by procedural track. These turns must be flown exactly as depicted.
This contrasts with PANS-OPS which assumes (though I can't find an explicit reference) that the procedure designer will choose the reversal and the pilot will fly it as depicted.