A couple of years ago I bought an inexpensive ($10) plastic areomotor (Aermotor) windmill for use on my indoor layout. With a bit of weathering and spraying with Dullcote it easily passes my 10’ rule.
I just received a catalog from them in the mail and thought that I would pass on their information. They have a number of 1:20 scale farm toys and rodeo figures. The vehicles are too modern for me but I might consider some of the animals.
Hopefully there will be something of interest that you won’t be able to live without.