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I wish you the best of luck and God bless you!
Unfortunately, someone who has not been charged with a crime, would not be entitled to any type of free public defended, until and unless the person is in fact charged with the crime, so the only option would be for the person subject to a grand jury inquiry is to either hire a local criminal defense attorney or to appear without an attorney and then plead the fifth if any questions asked could be of incriminating nature.
It does appear that a fee of $10,000 to attend grand jury hearing is extremely excessive, so I would suggest that you contact several local criminal defense attorney and compare their quotes for fees and also their training, experience, education, etc...
You can find an experienced and skilled local criminal law attorney by using this established and reputable attorney information / referral websites:
When, choosing a local attorney to represent you, it would be a good idea to choose someone who has a practice exclusively dedicated to criminal law, has at least 10 years of experience and handled similar matters and also regularly practices before the court located in the jurisdiction where your matter might be heard.
I wish you the best of luck!