The qur'an and the sunnah prophet () teach us to do deeds the best we can. And they also teach us not to go to extremes and overburden ourselves:
The Prophet (ﷺ) said, "Religion is very easy and whoever overburdens himself in his religion will not be able to continue in that way. So you should not be extremists, but try to be near to perfection and receive the good tidings that you will be rewarded; and gain strength by worshipping in the mornings, the afternoons, and during the last hours of the nights.
The qur'an teach us that eating pork is haram, but it is nowhere said that pork contaminates any other food by any means.
A contamination by impurity najasah is only given for najasah that has a liquid state such as wine (alcohol). Nevertheless still Islam is a religion of ease and the ruling is that little of najasah has no impact of the impurity of a whole lot. So there's no reason to be too stingy.