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You are correct - standard SMS (green bubble) messages are not part of iCloud.. only iCloud messages (blue bubble) are visible on other iDevices using the same iCloud account..

I dont know what Viber is, but if it's some sort of messaging platform that does not sign in/share/use iCloud as it's delivery mechanism, then, it would also be 'safe' .. Using a 3rd party messaging service is probably the safest because i think it's difficult to force SMS messages between only two particular iPhones (ie turn off iMessages) without fully turning off iCloud messaging (which you might not want to do)..