You need that radio license to legally fly so you don't risk it. The government agencies who issue them are like any other bureaucracy- the less you have to deal with them, the better, even in the Congo. Getting an answer on legality from them may be troublesome, but if you have a letter saying OK that should keep you in the clear with them- then it's just a chat with the ATC guys whose want safety as much as you do.
If I were "indaloamman" I know what I would do and how I'd do it- but it isn't legal so I won't recommend it. If the guys in ATC know what's up and agree, then it would be an easy job regardless of whether the government agreed or knew about it, but without an understanding with ATC, just don't- use the phone instead.