I would still maintain that the Rohingya are not up to the job. Besides even before the Rohingya crisis started Islamic terrorist groups tried to exploit the situation and get a foothold in Arakan. If they managed to do it, you would see a lot of recruits from BD going there, joining them and upon return destabilizing BD itself. The other issue is Burma will easily turn it into a Islamic terrorism issue and the whole world specially the western world has not appetite for Islamic terrorism, we and Rohingya both would lose any international support.
Because of this reason, initially my opinion was if we were to go into the arming and training business we should only do so with the non-Rohingya who are fighting against the Burmese government. We could theoritically negotiate with those armed groups that we would finance, arm and train them in return for safety of the Rohingya and if they ever manage autonomy or an independent country they would recognize the Rohingya as their own citizens. If we go the arming and training route, even today I believe this is the best option.
Integration in BD is not acceptable. It will give the wrong message to the Burmese that BD is so weak they can get away with anything. They will try other sinister things in the future.
I detest this option primarily because it is assumed that BD forces have the capability to cross the Naf and secure a territory. Even if they can manage it, there is no reason to believe that the Burmese military will not start a prolonged war to gain back the territory, they will even resort to conscription if needed, it's their own land why won't they.
I am not convicned China will just try to calm the situation and won't support the Burmese whoheartedly. They have demonstrated that by giving veto repeatedly to support the Burmese. Moreover they have strategic interest in Burma, they are building ports and roads connecting Chine to the BoB. If anything they will fully stop supplying weapons to BD and mind you most of our equipment are from China, and they will supply the Burmese with anything they need, if they can't afford to buy they will supply for free.