Do you want gears?
No drive connection to give any drag at all if you use a roller clutch or cone clutch drive, and the ultimate in no noise no drag is a BMX freecoaster hub or to go the next stage a freecoaster/coasterbrake hub as made by Perry of Birmingham for the Moulton mini and also available as a Sachs Torpedo model. Aside from the bearings just 2 main moving parts The drive connection (which takes the rear cog and has a 2-start ACME internal thread) and the double ended cone (which floats on the external ACME threaded brake/drive clutch cone carrier).
A huge advantage of the pressure enhanced friction system of drive engagement is that the harder you press on the pedals the harder the cone is forced into the seat, or the rollers up the ramps.
It really is noticeable that the wheel goes almost silent when the drive disengages and you are running almost totally on 2 main wheel bearings. I also feel that the bike holds its momentum, and even catches up with bikes that have whirring ratchets when coasting downhill (my 110Kg weight might be relevant there though).