Just some few points that may be considered:
1) It is possible to unify Indonesia under British rule. However, the Dutch may just pay the British for to take back Java like what the Spanish did when British occupied Philippines between 1762-64.
2) The British East Indies might be limited to present day Indonesia, New Guinea, Malaysia, Singapore and Brunei.
Having both Mindanao and Northern Australia would be inpractical and be very costly for the British.
Mindanao would mean pacifying multiple Sultanates which Spain has not done so in its presence in Mindanao for the past 300 years. The Sultanates of Mindanao can actually win land battles from the British. In OTL It took the Americans 10 years and 20th century technology to do this, which is the .45 caliber weapon. Absent of .45 caliber, heavy casualty rate for the British and probably the same result with when Spain dealt with them.
1) It is possible to unify Indonesia under British rule. However, the Dutch may just pay the British for to take back Java like what the Spanish did when British occupied Philippines between 1762-64.
2) The British East Indies might be limited to present day Indonesia, New Guinea, Malaysia, Singapore and Brunei.
Having both Mindanao and Northern Australia would be inpractical and be very costly for the British.
Mindanao would mean pacifying multiple Sultanates which Spain has not done so in its presence in Mindanao for the past 300 years. The Sultanates of Mindanao can actually win land battles from the British. In OTL It took the Americans 10 years and 20th century technology to do this, which is the .45 caliber weapon. Absent of .45 caliber, heavy casualty rate for the British and probably the same result with when Spain dealt with them.