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Yes, accordingly, the L line is used just for initialization. After that it should not be used. By splitting K into K and L, we do start the init ok, but then we continue transmitting 10400 baud data on it. This could on some cars pose a problem (if they take it as an error state, or as an attempt to reconnect or whatever...) Jumping K to L to drive L is a quick fix, and it may work, but the solution goes against the standards which could leave a car doing strange stuff.
If the two ISO chips work (one for K and one for L) the extra cost is very small compaired to going the ELM 323 or ELM 327 route just for the L line. I just need two resistors before I begin constructing it and testing it.
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