I am only just exploring the options to see if this is feasible for me as an Sri Lankan
I am not sure I might be able to apply to many destinations without visiting the respective embassies as the visa reequipments for Sri Lankans are pretty tight. At least this is the case when you fly.
My main concern is visa for locations like EU, US, Canada, Japan, Austria, NZ, Singapore, Korea, etc. Also other the counties in grey.