Ehhhhh... It's pretty bad.
The thing is, even if you got the Buddhist bonuses for free without juggling they are only 'good'. They aren't super amazing, like Reformed, Protestant and even Shia's mass morale or the Catholic things you can get from Papal Favour puts the 5% discipline/+1 Dip rep Buddhism gets at best to a questionable level. You add the fact you've not only got to juggle to get your bonuses that if you fail to you are actively punished? No other religion punishes you as hardly as Buddhism does and even if you get it right it's bonuses are at best 'pretty okay I guess'.
Hinduism for example is pretty amazing despite the fact it's starts are only slightly better in tech compared to Chinese. It's only major weakness is being slightly lacking in conversion strength but that's not a 100% deal breaker and there are workarounds. Buddhism getting -10% discipline is an absolute deal breaker and the benefits don't come close to outweighing it. I'd still rather have the non common sense version rather than risk juggling. The risk is simply not worth the reward and for it to be worth it, it would have to be borderline broken.
This is another reason why I want to see what the Devs pick if they start with 32 custom nations. I want to see what ideas, how much land they take versus ideas, Monarchy, Theocracy or Republic but also in those choices is that of religion. See what people choose when they are not constrained by area. Whether it's just for fun (which is also a currency) or playing to win.