Congrats to your dad for restoring and preserving a great piece of American aviation history! I’m glad that your OTW is alive and well. With your experience you shouldn’t have any problems with the OTW on pavement. If you can fly a Champ, you can fly the OTW. It’s an elegant lady!
In lieu of a published crosswind component, it comes down to personal limitations. The OTW has lots of rudder. I’ve landed with a 12kt. component and still had a bit of control remaining. The large rudder stays effective deep into the rollout. However, the biggest problem I find is not the landing so much as it is the taxi ability. That big rudder and vertical fin now fight you on any turn across the prevailing wind.
If I had one comment about crosswind landings in the OTW, it is the cross control technique will feel exaggerated. The ailerons and rudder are very effective.
Those brakes are just a suggestion! I generally don’t use them above walking speed.
I hope this helps. I’ll be anxious to read any other input from other OTW experienced flyers.