I like your idea, but I dont think it is necessary considering I would never give rare gear to someone I didn't trust absolutely.

What I would really like to see is "Bound to Company" gear tag. This would allow Companies to Bind Gear to Company Bank so people cannot Join grab and ditch like so many used to do in XI. If a person does leave with Gear Bound to the Company it would automatically be removed and returned to the company Bank.