Whether you convert or not has nothing to do with whether you can worship Buddha at home, because learning Buddhism is just learning how to seek the Buddha's dharma in your heart and how to see your own nature clearly.
Kowtowing is a unique way of worshipping Buddha in Tibetan Buddhism, just like worshipping Buddha in Han Buddhism, but the way of worshipping Buddha is somewhat different, but the essence is the same. They all respect Buddhists and repent their karma.