We took a lesson from old record player turntables (ask an older mentor
). The platter was often driven by just a rubber roller in contact with the platter inside edge. We are using a non KOP turntable that has an edge about 0.5 inches high. Turn a Keyang motor gear's upper portion (not the lower portion) to .625 OD. McMaster Carr sells drive rollers with a compatible ID for about $20. Slip the drive roller onto the Keyang, mount near turntable so frictional contact made to inside or outside. Works great. Our rotation rate about 10 seconds for 360 degrees. Denso's would probably yield about 7 seconds per 360 degrees on our design. Design will slip if rotation is limited for some reason and not break. There are ways to tell where you are rotationally without limit switches and encoders....
Design is safe even if exposed.
Stop by our pit at Hartford and the team would be happy to show it off. Good luck!