Absoluted Encoder but Move the G53 Origin

Hey, I need some help.
   I have configured a machine  using LinuxCNC, and the joints are equipped with absolute encoders. Now, I want to achieve the following: Point A is the zero-count position of the encoder, but I would like to set Point B, which is offset 200mm from Point A, as the G53 origin. How should I configure this?

Here is my ini configure:
[JOINT_1]
TYPE = LINEAR
MAX_VELOCITY = 1200
MAX_ACCELERATION = 2000
#       MIN_LIMIT = -10.0
#       MAX_LIMIT = 10.0
HOME = -10
HOME_ABSOLUTE_ENCODER = 2
HOME_OFFSET = 35
HOME_SEARCH_VEL = 0
HOME_LATCH_VEL = 0
HOME_IGNORE_LIMITS = NO
HOME_USE_INDEX = NO
HOME_SEQUENCE = 1
VOLATILE_HOME = 0

But the problem is when I homing the axis, the joint->motor_pos_cmd whill change suddenly.  which cause the joint move suddenly. It is particularly dangerous.

Thank you for ur help!
    

I modified the homing.c to get it.