I'd be curious to hear more about why you think they'd work well together.
This is the problem with combo guards, and it's why combo guards basically fell out of the NBA for a while. Steph Curry brought them back, but that was its own dynamic.
Combo guards are combo guards because they lack important abilities. Usually a combo guard is smaller than a SG and shoots worse than a SG. He has a better handle and better playmaking instincts, but not as good as a PG.
25 years ago, the combo guard made sense as a complementary piece. Roy used to love combo guards at Kansas. That's because the strengths of flexibility outweighed the weaknesses.
But that's not true as much these days. Now that 3 point shooting is so good, turnovers are even more of a problem than in the past, as they set up open in-rhythm 3s, the best shots in the game. So you definitely don't want your SG to be playing PG. Also, vision is more at a premium because the "dump down into the post" play is no longer a staple action. In order to get your shooters the ball, you need a PG. But then your combo guard has to play SG, and that's a problem because he isn't a great shooter usually. And again, with 3 point shooting being so good, perimeter height is important -- both for effective challenges on jumpers, and also for dealing with penetration, since help is less available in today's game.
So to me, if a player is described as a "combo guard" that's a pretty negative feature for me. Not saying the player couldn't still be good, but it's a strike against him.
And RJ is hard to pair, because he's a ball dominant shooting guard who is very short. You need a tall PG to pair with him, and tall PGs also tend to be ball dominant.