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High heel <---> low heel

Good evening, comrades!
I have finished rig with a high heel.
It took the option of a low-heel rig.
I want to make the switch “high heel” - “low heel”, without using a second copy of the legs.
I made offset groups IK, FK, and setup them for switching.
In a modified “low heel” mode:
Switching IK/FK, FK/IK through the attribute works well.
Switching IK/FK through a synoptic works well.
Switching FK/IK through a synoptic works poorly (limb lengthens).
Do you have any recipes for this trick?