Re: Coaster breaks
A pair of C brakes on a single speed coaster brake bike work well and you still have a foot activated emergency brake, but I find using a 7-speed beach cruiser to be a better base.
Dual V brakes are better than dual C's, and mounting the drive sprocket is a breeze, on the Micargi Pantera 7S the sprocket practically centers itself on the hub and there is no coaster brake arm to remove first.
This particular bike also has horizontal dropout's so you don't even need a tensioner, just move the wheel back to adjust drive chain tension.
That does leave you with a shifter on the handlebars, no problem with a 1/2 grip twist shift, I put the shifter upside down on the left after the clutch lever and then use 1/2 a grip to the handlebar end.
One last thing you will like better is having gears for pedal help, especially for starting the thing ;-}