Any question answered...

Keep nishiki as is, the paint and chrome are in great condition and it really would be a shame to have to rechrome the ends which is frightfully expensive. Keep the nishiki to make a different kind of bike.

Get the aende to ride as your simple everyday fixed.

As the nishiki has mudguard eyelets it could make more of a utilitarian bike.

Just selling the nishiki, i have bob for my road/gears and it'll be a bit too big for me with drop bars and ergo levers i think