Allow me to mock-respond IC to an IC claim:
There is absolutely no wiggle room on the question of owning Home.
And do note that the Caldari have tried to use diplomacy for almost two centuries with no success. This homecoming in force was inevitable.
Bullshit. No such attempts have been made that is documented and publicly available so this blatant lie you will have to try and sell elsewhere.
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Unless ofc, there is. I have not found anything regarding it anywhere, so can someone point me in the right direction?
And even if it was/wasn't attempted, what do people think of the issue presented here, could diplomatical return of CP happen, why/why not and what do you think the terms of such a deal might be?
It isn't expressly said one way or the other if diplomatic attempts were made by the various Caldari corporations/persons to regain a foothold on Caldari Prime.
You are immediately discounting the option that certain Caldari megacorporations might pursue independent diplomatic negotiations with the Federation (see the Blind Auction chronicle and Ishukone) in order to meet some of their needs.
Why wouldn't SuVee seek to buy up property on Caldari Prime as a two pronged power play? Why wouldn't Wirykomi or KK attempt to gain routine access and ownership of ancient familial lands?
If it was any of the corporations, the expected response from the Federation to Caldari megas buying land and resources (whatever there may be) on Caldari Prime is likely no.
So, while it is not expressly stated anywhere that there were diplomatic overtures, it does not mean that there were not.