Sounds like you need a carrier made to fit an existing disc.
I have made them but not equipped to do so at present.
For light use , like lower hp, you can adapt a front wheel with ribbed hub, your disc will bolt on. Then you have to mount a sprocket and spacers easy if you can live without a cush drive. .
The first F disc hubs are way over built for bike use, everything is smaller , lighter now.