Thanks for the ideas.
Why can't you just put suitable chainrings on the front and run the chain straight to the rear hub?
Although this might run the risk of 'Chains a bit slack' comments.
All the images of long chains show the chain sagging which I assume leads to chain-'bounce' when going over a bump. I also suspect the extra weight of the chain would affect shifting.
I suppose something like a ghost wheel/sprocket/whatever you call it is no good then?
Mostly, the cargo to be carried would be food shopping. Thusly, a phantom chainring would be too appealing for children outside the shops to play frisbee wiv.
presumably you want something for the other side of the BB as well, or are you just going to leave the axle sticking out as is?
Planning a naked axle non-drive side.
istr that specialites TA might have had the detachable spiders, there's probably a page in english if you look, I'm sure there was last time.
Looks like the TA chainwheel is secured through the arm, the spider being fitted to the arm.
Easiest thing would be to acquire a cheap chainset and saw the arm crank off. On the more traditional designs it would be possible to make a very neat job.
This is now where I'm at. Since it seems a shame to amputate a usable crank, does anyone have a double or triple chainwheel with damaged pedal threads?