It seems to me that any person can go before a Safer Torah on Shabbot, even better go in a group of at least three and pledge to abide by the Torah commandments in front of his/her peers. If all the peers who stood and made this pledge at the time of the public reading of the Safer Torah on Shabbot, I would consider them as valid witnesses, in the process of forming a Bet Din, at a later time, of laymen for the specific purpose of Cut a Brit with the Elohim and with their allied Bnai Brit peoples.
Obviously a Bet Din of laymen does not qualify as a "court" to authoritively rule upon the intent of the language of the written Torah.
However a Bet Din of laymen can formally witness a person making an Oath-Brit while standing before a Safer Torah, and rule that So and so the son of So and so has formally sworn before Elohim and man to accept the Oath-Brit responsibilities and relationship with the Ancient of Days.
The burden of Cut a Brit has to be upon the hearts of the people Cut a Brit and not upon the hearts of the witnesses. The Bnai Noach non-Bnai Brit people are not dependent upon 3 shabbot observant laymen and/or rabbis to agree to form a Bet Din. Its very important for non-Bnai Brit people to know that Rabbis are laymen, Judaism does not have a clergy in the christian sense. A Rabbi is just someone whose learned enough Torah to gain the respect of his peers. Some Rabbis learn to a sufficient degree to become qualified to become a diyan/shofet/judge but not all Rabbis are qualified to become judges. Irregardless, any Bnai Brit person that keeps shabbot has the qualification of forming a laymen's bet din. The Bnai Noach folk equally can do the same.
