No-one seriously uses a CRP in flight for a diversion do they?
Draw line on map - LOOKOUT - estimate track - LOOKOUT - estimate effect of wind using MDR / pre calculated max drift - LOOKOUT - estimate heading - LOOKOUT - estimate distance - LOOKOUT - estimate time enroute - LOOKOUT - diversion planning done!
Worked fine on my CPL skills test and with all the PPLs I teach.