Time series interval extracion: different start and end conditions

In medical setup, a Febrile Neutrophile episode is defined for having a low number of neutrophiles and a fever, but the end of the episode is just defined by the end of the fever, independently of the number of neutrophiles. Also the temperature to consider "fever" is higher to enter the episode and lower to exit it.

It doesn't seem like the Time series plugin interval extraction recepe allows for such a doble condition.

Anyone knows a trick to achieve the same result ? I'm thinking I could make a pair of columns indicating if the enter and exit conditions are triggered but still I can't tell the Time series plugin to use 2 different columns for start and stop conditions.

Any thoughts?