The German Morgan Dealer Morganpark sales his own steering wheel. These steerings wheel are a bit flat at the bottom (minus 10-12mm) which is not really visible. Maybe this could be an alternative to a new hub and be less complicated.
Steeringwheels
Pricelist
Contact is lars.bubert@morganpark@de
Maybe they can provide some information in English if you contact them by mail.

BR
Christian

2006 4/4 70th anniversary, 1985 VW 1200 50th anniversary, 1977 Vespa 50 Special, 2003 Vespa PX 200E