Set whatever object you want as the master object. It'll clean up all the other selected controllers to only have keyframes when the master controller does.

Conform Keys.py

masterObject = "controllerName"

import maya.cmds as mc
objs = mc.ls(sl=1)
 
keyframes = mc.keyframe(masterObject,q=1)
fs = int( mc.playbackOptions(q=1, ast=1 ) )
fe = int( mc.playbackOptions(q=1, aet=1 ) )

keyframes = sorted( [k for k in set(keyframes) if k>=fs and k<=fe] )

objs = mc.ls(sl=1)

for f in range(fs,fe+1):
    if f in keyframes:
        mc.setKeyframe(objs,t=[f],i=True)
        
for f in range(fs,fe+1):
    if f not in keyframes:
        mc.cutKey(objs, time=(f,f) )