How to illegal multiclass?

I want to start a new game with a duo party and mess around with classes. I looked into it and people share ideas for illegal classes, but I dont quiet understand how to do it in EEkeeper. I would like to make a Kensai/Thief multi for example. Do I just make a F/T, go to Characteristics and select Kensai kit there?
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What you wanna do is make a Kensai, go to EEkeeper and swap it to a Fighter/Thief and retain the kit/subclass Kensai
Let Thief level remain at 0, and you will be able to level it up to 1 on first xp gain (if your xp is zero)
However.. this will lead to inflated HP, which is technically a cheat.. but who cares at this point?
The times i do this sort of thing, i set both class levels to 0, HP to 1, remove all weapon proficiency points and all thief skill points if i have any.
Essentially start the class choice of character creation over from scratch to remove any cheatyness beyond the illegal class.