CombatExtended VS Rimefeller

Combat Extended does have an autopatcher you can toggle built into the mod settings if you're willing to deal with some slight jank, there is an absurd amount of patches built into CE, so I'd try it with the mods you want and test it out

However, Combat Extended does have a large collection of patches in the mod itself, and has a list for your convenience. Popular mods typically gets patched up by these guys, especially vanilla expanded.

They've done a lot to work on compatibility. Feel free to take a look at what they have compatibility patches for here.

you can also use this list but I guess that one is better since it shows when it was last updated so you can check if the patch is up to date with the mod.

The only mods I've ever seen that are incompatible with CE are beam guns and bounce guns. They introduce weapons with special projectiles that seem to be fundamentally incompatible with how CE handles them. Otherwise, obscure HAR mods, gene mods, every faction mod I've heard of are all in the compatibility list. I think I saw VE Factions - Empire in this list even before it was released to public.

The Rimmu-Nation collection (Weapons, Clothing, and Security) is part of the mods supported by Combat Extended's internal compatibility patch, so you should be fine unless they had been recently updated and their new version broke the CE compatibility patch.

Did you check the compatibility list?

Are you subbed to 2 versions of CE, i would recommend getting the version from git hub: https://github.com/CombatExtended-Continued/CombatExtended