Remove and Reattach the Knob on a Bolt

I have a bolt with a knob on the end for a monitor stand that I'm using on a standing desk converter. Unfortunately, the bolt is just a hair too long and it ends up preventing the standing desk from collapsing completely. This isn't a major issue, but I wrote the company about it and they at least sent me a second copy of the bolt that I could cut down.

This would be somewhat simple, except that the bolt itself has a hollow end that has a screw which holds a plate in place-- as a result, I need to cut the bolt off at the end with the knob. But I would still like to actually have a knob to tighten the bolt, so I was wondering if anyone has any suggestions for removing it without destroying it. My current thought is potentially boiling it to try and release any glue/locktite/etc holding the knob in place and then try to work it free, using locktite or something to get it back onto the bolt and secure enough to use. Alternatively, I have seen some threaded knobs that I could potentially buy to replace it, but at that point, I'd probably just use pliers to tighten it up.

Google hasn't provided much in the way of suggestions that don't seem like they would destroy the knob beyond heat (and it's possible it's mechanical and not even possible), so I thought I would check Reddit and see if anyone has other thoughts first.