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No need for a plug or insert.
Just file down the end and bang the grip on yourself. It won't rip the grip and you won't feel a thing. There's no plug in there to start with anyways.
It's literally a 10minute job for the entire de-grip, measure up, cut, file, re-grip process.
It's so simple that its's literally not worth taking to the pro.
Surely you know someone with a vice or a workbench jobby.
All else you need is a metal saw, file, knife to cut off the grip (which should be done before measuring up and cutting down) double sided tape and white spirit.
It's not about your height that relates to club length, much more the distance from hands to floor when in you stance.
I recently took an inch an a half of my bettinardi putter and I honestly am so much more comfortable over the ball and as a result, more consistent on the greens.
I started a thread on the subject but am too lazy to link to it...