The kl26p100 board is not a general-purpose MCU. I haven't been able to find the SDK provided for it. I'm sorry for the inconvenience caused.
Using the SDK of KL46Z is indeed a good idea. However, KL26 and KL46 are not completely pin-to-pin compatible, so you need to modify the code by yourself.
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I suggest that you refer to the Reference Manual of the mkl26z256vll4 to modify the code. And you can use the MCUXPresso config tools.
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Hope it can help you.