Brother, the office to send your passport to is Singapore VO, right? If that is the case, your situation is easier than you think. What you need to do is use DHL to send the documents to VFS office in Singapore and they will deliver your package to Singapore VO. Once decision is made on your application and visa and COPR printed, the VO will pass to VFS and VFS will pass to DHL. DHL will then send to your address. This is how VFS deals with countries where there is no functioning office or no office at all.
Contact Singapore VFS on their phone and they will guide you with the steps.
https://visa.vfsglobal.com/sgp/en/can/
Contact us
Helpline
Please contact us for any information regarding the visa process:
Contact us by phone: +8008526574
Contact us by email:
info.cansg@vfshelpline.com
Contact us by chat:
Chat Now
https://visa.vfsglobal.com/sgp/en/can/contact-us
It is better to call them or chat online. Email response with VFS usually takes 1-2 days to reply. So, phone and chat are much faster.