In Portuguese you could say: "cuide-se" (ha det mycket bra) or maybe "fique bem", could you maybe say something similar in Spanish?
Just one more little thing: doesn´t "löjliga" mean "funny" or "weird" (in a funny way)? (I´m not sure here, I´m just asking because "løjerlig" in Danish means that)
I think my question has already been discussed above - the "take care" part...which I feel is more important than the "regards" part. But fine if saludos in your opinion covers it