Firstly, I have no idea what is the point of training sailors on a sail ship, regardless western or Chinese. The sailors in the sailing era were trained on the same ship they used at the time, so can and should be best that today's sailor being trained on modern ships.
That being said, there is one reason against Chinese traditional sailing ships. The sailing skills of handling Chinese sail ships and the experience of building Chinese sailing ship of that size were lost ever since the end of Zhenghe's voyage in 1433, that is almost 600 years. For whatever reason if PLAN need a sail ship, the only way to build it and have training curriculum in place in a few years is looking to the west.
There are still many in Hong Kong, and Westerners have also recreated them. Junks traveled the seven seas and their story never ended with Zheng He.