The best thing to do is get a vintage one, and soup it up with some parts. Ride it and see if it does what you want it to do. If it does, you can find a company to make/sell you a modern one and spend some real coin.
Most of them came with 27" x 1 1/4" wheelsets. You can put 700s on and still have room for big tires.....and fenders.
Last edited by seypat; 12-30-22 at 07:17 AM.