i reckon Maui thai for kicking and boxing for striking to have both gives a great striking base with judo it be a great combination to have and have wrestling with it for submission and ground base to have with it mate
I understand you want to mix your martial arts, but take this scenario in consideration: a quick punch is coming at you. If you are trained in multiple arts, you have multiple ways to think about how you are going to react to that punch. If you are solely trained in Judo, your thought of reacting to that punch will come much quicker.