Hi Nikhil
Why not create a new FSV for Singapore and create a node in FSV where you club both the relevant GL Accounts under the same node. The primary reason your business wants to see balance at one place is that they are related and from TB/Balance sheet perspective they should be reported in total. Most customers have this kind of requirement and the best way to handle this is to club the GL under one node,say taxes.
This is how most of the global customers use SAP
regards
Sanil Bhandari