Have you looked into a modern slip joint? LionSteel, Fox, Viper, and MKM are out of Italy. Maybe something like this?
https://www.collectorknives.net/sho...-od-canvas-micarta-handles-m390-steel-jk1cvg/
https://www.collectorknives.net/sho...rs-bison-micarta-handles-m390-steel-fxck01bi/
Part of the problem we have is knowing what is available and legal in Spain/Europe. I would *guess* a slip joint with blade under 3 inches is legal in most places but check your laws of course.
Or do you want a locking knife?
Is there a retailer over there that sells Manly knives? I think they are out of Bulgaria. They had US distribution at one time, but not sure what happened to them. They made a nice folder for the money IIRC.