Just be aware that over the course of the companions there is a gradual, but definite power creep, and you need to be aware of that so that if it causes issues with your use of the RMC core rules, you know why.
However, having said that, you should have absolutely no problems integrating those products with RMC.
2 specific points though....
1) Power Point Development is a skill that changes the focus of the game in a large manner, making spel users much more powerful....
2) In RMC, there are some options for giving additional DPs to players when you add more skills. I would recommend being VERY careful how many skills you add. One suggestion that is not in the RMC book would be to add 1 DP for every 2 skills added (up to 25% of their normal amount of DPs) - there is also an Option for static (non-stat based) DPs each level, and more...
As I have said before, just be aware of what you are adding, option-wise, as the options you select can have a great impact upon the system.