A problem with re bar would be the tendency to decapitate the chicken. I have done that before and it is quite messy
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The birds I need to do in are x-large 1 yr old cocks, so yeah, pretty tough.I have accidentally decapitated before using a broom shank and didn't find it particularly messy at all. I would certainly encourage you not to be afraid of that outcome as it is better to pull too hard rather than not hard enough, particularly if you are doing surplus cockerels at 16+ weeks as oppose to 6-10 week Cornish X, as their ligaments and sinews are much tougher.
I ended up doing those birds the regular way, but I processed some more today and tried the broomstick. It worked fantastic! I'm never going back to decapitation again.