Taipei is 2.25 hours ahead of Kathmandu
Best overlap: 8:45 AM to 3:45 PM in Kathmandu is 11:00 AM to 6:00 PM in Taipei.
Book within 8:45 AM to 3:45 PM Kathmandu time (11:00 AM to 6:00 PM in Taipei) and both teams will be at work. That's a roomy 7 hours of common time each day, so finding a slot that suits everyone is rarely a problem.