Pakistan will have no problem training BD forces either. In fact if BD/Pak relations improve(or ideally had improved a decade ago) u would find Pak siding with BD. BD/Pak still have much more in common than Pak/Myanmar. Haseena has been the thorn that is generally responsible to keep the two countries apart...mostly due to her own animosity and at India's behest.
In any case...coming back to the topic of the thread...
IMO it wouldn't do much good for BD to go through UNSC. China and possibly Russia are likely to veto any action against Myanmar. The best bet would be to approach China behind closed doors...and offer some lip service that implies BD wants to increase cooperation with China and get out of the sphere of influence of India...that and throw a few development projects their way.
China is keen on winning over countries to its side rn(especially with tense border situation between India/China). There has been a tug of war in Sri Lanka and Nepal between India/China factions. Use that in ur favor to get China to keep Myanmar in line. A key thing to note here is that BD doesn't actually have to take sides with China against India or vice versa. Just carefully play the field to buy urself more time...during that time focus on building a strong military...bcuz such a ruse can't be kept up for long.
@Avicenna ur thoughts?