Actually you really came to the same conclusion that I did, Hink. As long as they don't drag their feet between reviews and approvals, the TR's would seem to be a quicker path.
I know the Amendment process would include another public notice and objection process for CGFI to go through.
I would need to check the Hard Rock mining Rules about the TR process. If CGFI can avoid that, the Technical Revision would be the way to go.
Don't take my word for it, Do your own research! Then you will know it's true!