Chumra is any stringency that goes beyond the letter of the law.
The ‘organic’ term lechatchila has no place here. l’chatchila means you shouldn’t do it but if you do it it works, for example, l’chatchila you shouldn’t write x in a shtar but b’dieved if you did it it still works. How is that noge’a to c.s.? l’chatchila you shouldn’t eat it but b’dieved you still ate it? It doesn’t make sense.
It happens to be that the term l’chatchila evolved and now every chumra people call l’chatchila. But in truth we’re dealing with a chumra, and the term l’chatchila is irrelevant.