Any possible issues with adding heat/cool down cycle in the end of print (PLA)
Heating PLA even to 60°C will make it pliable and may affect dimensional accuracy; 100°C is likely to make that severe. Being stuck to the bed and thus constrained by it might help some, but I think it's a bad idea.
If your PLA is hard to remove, you probably have bed leveling issues. PLA should remove easily after cooling from reasonable print-time bed temperatures of 40-60°C to room temperature as long as it has not been extruded against the bed with excessive force (from being too close and having nowhere else to go).