I have just checked the wording on Bones of Li-Peng, and it states explicitly "higher than your actual monk level". Therefore it unambiguously does not stack with any other effect that also includes such wording. I would argue, however, that the contrast of this with the Monk's Belt and Superior Unarmed Strike, both of which omit "than your actual monk level", is a point in favor of the Belt and SUS stacking, and the principle outlined in the FAQ of applying effects in whichever order is most beneficial when no other guideline is given would then mean that both the Belt and SUS also stack with the Bones because you can apply the Bones increase first and then the other two on top of that.

I'll leave it at that, as this isn't the right place to hold an extended debate on the subject. If anyone wants to argue this, we should take it to another thread. I think there's an existing one that hasn't hit the necromancy threshold yet.