Well..I was going to read your entire post, but then I got to this:
...Cali Kings can't even be kept the same way as your average Pantherophis, how do you figure that 70% of all snakes under Colubridae could?...
And quit because you are absolutely, positively, without a doubt, 100% WRONG. L.g. californae can be kept under the EXACT SAME CONDITIONS as a MAJORITY of the Pantherophis genera of snakes without any issues.

How else do you explain the FACT that you can find Cali kings in the same area as several species of ratsnake, including, but not limited to, obsoleta, spiloides, and emoryi? How esle do you explain the FACT that California king care is precisely the same as Florida king care and floridana are found in the exact same locations as guttata? How else do you explain the FACT that with MINOR variations in temperature(and we're talking 3-5*F here...not 10 or 15...) you can keep ALL snakes in the Lampropeltis genus, and they are mostly found within FEET of many species in the Pantherophis family?

I won't even bother reading the rest of your replies if this is any indication of your how well you know these animals and their captive care requirements.

If nothing else...please realize that a difference of 3-5*F is something that all 50 of my Lampropeltis, Pantherophis, Lichanura, Pituophis, and Thamnophis are seperated by, and they all thrive and reproduce...without any issues. And I have done it this way for 20 years and change without a single issue...

Nitpick the "misuse" of taxonomic terminology all you want...the above are all facts that you simply cannot argue with, my friend...

By the way...How many North American colubrids do you have in Finland? How much native habitat and observation of these animals have you actually done that gives you such knowledge of what they require to be kept successfully in captivity?

A better question would be...whose care sheets are you reading that have thrown your captive care requirements for these animals SO far off base that you actually and honestly believe that a Cali King and a Texas Ratsnake can't be kept under the exact same conditions?

To the original poster...I'm sorry this topic got dragged so far away from your original question. BACK to that question...care for a Cali king is extremely easy. Follow any caresheet worth it's salt for a cornsnake, kingsnake, gophersnake, bullsnake, milksnake, ratsnake, or rosy boa, and you'll be just fine. Don't worry about the rest of this topic. If you have any specific questions...shoot me line via PM and I'll be happy to help you out...I'm done with this topic...