I dunno man, that's probably gonna be too much of a difference, especially on the basic frontline infantry units that players are just about never going to go without so that'll cause a new (though smaller) problem where everyone's going to basically only have two actual bulletin choices. Only time I can really see being able to go without that would be Prostruppen players and maybe RE spammers (which I really dunno if it's any near viable anymore).
it's already doable though, if you're lucky enough to get three of a good bulletin like +7% nade range. this just makes it so that people who don't have 3 can use it and so that bulletin always make a difference rather than 90% of bulletins being pure shit, a smaller fraction being useful if you stack 3, and some being OP if you stack 3. it also makes it easier to balance.