The best plan from Kansai Airport to Kobe Airport: high-speed ferry, which can be reached in 30 minutes and can go back and forth. There is a free bus from Kansai Airport to the ferry terminal for 4 minutes. Kobe airport is small, get off at the new traffic light rail and walk for 4 minutes to the dock.
At present, holders of short-term tourist visas can enjoy 500 yen, about 30 yuan RMB, once. Thank you.