export_at_origin.py

from maya import cmds 


# Iterate through everything in the user's selection
for item in cmds.ls(selection=True):
    
    # Store the current position
    orig_pos = cmds.xform(item, query=True, worldSpace=True, translation=True)
    
    # Move the item to the origin. This will move where ever it's current
    # pivot point is set to
    cmds.move(0,0,0,item, rotatePivotRelative = True)
    
    # You would perform the export here
    print('Do Export')
    
    # Now we can move the item back where we found it. Comment this line
    # out to check the items are going to the origin as you'd expect. 
    cmds.xform(item, worldSpace=True, translation=orig_pos)