Ok I think I understand the intention now. Here is a thought of how to do it with timing belts. 6 half axles and 2 common shafts M1 and M2.

All 6 half axles would all need to be horizontally adjustable to tension the 6 belts. Everything could mount to "2D" vertically oriented sheet metal or laser cut parts, and the same shafts, bearings, and sprockets could perhaps be used throughout. The trick is getting the tensioning process to be reasonable. Bit of a mess as a concept, to be honest, compared to 6 individual motors.

Ok I think I understand the intention now. Here is a thought of how to do it with timing belts. 6 half axles and 2 common shafts M1 and M2.

All 6 half axles would all need to be horizontally adjustable to tension the 6 belts. Everything could mount to "2D" vertically oriented sheet metal or laser cut parts, and the same shafts, bearings, and sprockets could perhaps be used throughout. The trick is getting the tensioning process to be reasonable. Bit of a mess as a concept, to be honest, compared to 6 individual motors.

PS- if the range of angular motion is finite, like 120 deg or less, then replace the belts and sprockets with linkages to drastically simplify