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Yes, you would have to pay 3CP to get any of the non-Inquisitor Inquisition units (Jokaero, Acolyte, Daemonhost, etc) without breaking the detachment bonuses in your other detachment. Within that 3CP detachment you can take only one Inquisitor, but up to 3 of any other datasheet, just like normal. In other words, it's completely useless and impractical and nobody would ever do it except for a laugh. All the non-Inquisitor Inquisition forces may as well not exist for competitive purposes.

You can take one Inquisitor OR one Assassin, but not both, in any Imperium detachment. They lied in the PR spin about Pariah to say you could include any Inquisition forces in any Imperium detachment without turning off your detachment rules, but this was false (and is still up on their site, still misleading people). The only thing you can take in a non-Inquisition Imperium detachment is one Inquisitor.

They did say you could take an Inquisitorial patrol, but they were laughed off the internet so hard that they actually stealth edited that article to say Vanguard instead.

The false statement that you can take "all Inquisition forces" in Imperium detachments without breaking detachment bonuses is still up there, though, well over a month after I flagged it to them and was told my feedback would be passed on to the warhammer-community team so they could fix it.

They converted it to a strat to swap our your assassin before the battle. Still costs 2CP, but you only pay it if you actually make a swap. So you can take whatever one you want, and only pay if you want to switch it.

Technically it's broken because the interaction with the 9th rules doesn't work (see goonhammer article for details), which is classic Gee-dubs "designed with 9th in mind!" nonsense, but only the that-guyest of that guys would stop you doing it.

Yeah I dunno why anyone would think taking one inquisitor or one assassin would break doctrine, it specifically says it doesn't.

Now if you took more than one in the detachment, yes, that would break the doctrines.

Nothing. You're confusing two different things. The problem Goonhammer identified has to do with the 2CP strat to swap assassins. Technically this doesn't work in 9th, because of the order in which you have to do things in the 9th edition missions.

Now I say “would be” here because currently, the rules for this do not actually work. The mission rules in 9th edition specify that non-random “before the battle” abilities and Stratagems now happen after deployment, which means that if you use the Shadow Assignment Stratagem, it has no effect – the model you’d replace is already on the table. This is obviously stupid and broken and unintended, so my personal recommendation to you is that you make this decisions after choosing a mission, at the same time you’d roll for random abilities under the rules.

https://www.goonhammer.com/9th-edition-faction-focus-assassins/

It's classic Gee-dubs, and I certainly wouldn't try to enforce it against someone else, but technically they are right that the swap assassin strat is broken in 9th.