Creating military bases of Pakistan, China brothers in both of these mentioned countries (Nepal and Sri Lanka) have no problems to creating more for us, which I have earlier said are somehow being there, so we ISI can also launch covert action too, from both these countries deep inside Indian Territory's. Yes, ISI can also launch covert action from both sides as Sikhs are demanding something Khalistan so can be fed through Nepals side border, on other hand using Sri Lanka, to fuel the issue of Tamil, Telugu Kerala people which they want independence (I'm not saying they themselves asking for this to the whole world) Can be fueled too, and Sri Lanka would also happy to allow our ISI to avenge this because of the Indian terrorist army trained Tamil tigers and spread terrorism in their country, so both countries fronts are open for us, military wise as well as using a proxy and covert action operation deep inside Indian territory.
Creating military bases of Pakistan, China brothers in Bangladesh is I think a chance possible because our brother China is already making economic investments there, but yes using a proxy through their country by using covert action operations and reach many Muslims states to fuel for something massive blow to the Indians army and government is also possible