There are hubs with 6-bolt disc attachment both sides, so you could fit a disc and a 6-bolt sprocket. They come in 20×110, which is easy to adapt to pretty much any axle standard, although you'd need to make new end caps as well as axle/tube/spacers for 100mm OLN front types.
There are hubs with 6-bolt disc attachment both sides, so you could fit a disc and a 6-bolt sprocket. They come in 20×110, which is easy to adapt to pretty much any axle standard, although you'd need to make new end caps as well as axle/tube/spacers for 100mm OLN front types.