Just by reading Slimbook info* might easily answer your question indirectly: “Although our laptop’s motherboard is manufactured in China (such as all brands), computers are completely assembled to your taste (with your RAM or your hard drive) in Spain. Employing people in our country who are specialized technicians.
The operating system is also installed by our technical team.”
Also, as Librem 14 might easily become the one of your best choice, please see full menu for additional information on “allergens” here:
And if all of above doesn’t help (right away), even usage of chassis that is assembled within PRC serves well to the people that like to change things (we are accustomed to):
*https://slimbook.es/en/faq#where-are-they-manufactured